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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	May 08, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	TRXC
Entity Registrant Name	TRANSENTERIX INC.
Entity Central Index Key	0000876378
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		217,338,954

Consolidated Statements of Operations and Comprehensive (Loss) Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 2,181	$ 4,767
Cost of revenue	2,467	2,555
Gross (loss) profit	(286)	2,212
Operating Expenses (Income)
Research and development	5,655	5,265
Sales and marketing	7,674	5,970
General and administrative	4,560	2,676
Amortization of intangible assets	2,611	2,827
Change in fair value of contingent consideration	998	627
Acquisition related costs	45
Loss (gain) from sale of SurgiBot assets, net	97	(11,996)
Total Operating Expenses (Income)	21,640	5,369
Operating Loss	(21,926)	(3,157)
Other (Expense) Income
Change in fair value of warrant liabilities	(106)	1,829
Interest income	318	270
Interest expense	(1,116)	(656)
Other expense	(305)	(58)
Total Other (Expense) Income, net	(1,209)	1,385
Loss before income taxes	(23,135)	(1,772)
Income tax benefit	610	890
Net loss	(22,525)	(882)
Comprehensive (loss) income
Foreign currency translation (loss) gain	(1,949)	2,308
Comprehensive (loss) income	$ (24,474)	$ 1,426
Net loss per share - basic and diluted	$ (0.10)	$ 0.00
Weighted average common shares outstanding - basic and diluted	216,796	199,900

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 25,545	$ 21,061
Short-term investments	22,904	51,790
Accounts receivable, net	8,531	8,560
Inventories	15,197	10,941
Interest receivable	34	26
Other current assets	10,211	9,205
Total Current Assets	82,422	101,583
Restricted cash	578	590
Property and equipment, net	5,923	6,337
Goodwill	79,509	80,131
Other long term assets	1,695	203
Total Assets	216,976	239,307
Current Liabilities
Accounts payable	4,756	4,433
Accrued expenses	7,044	9,619
Deferred revenue – current portion	1,618	1,733
Contingent consideration – current portion	70	72
Deferred consideration - MST Acquisition	6,044	5,962
Total Current Liabilities	19,532	21,819
Long Term Liabilities
Deferred revenue – less current portion		109
Contingent consideration – less current portion	11,565	10,565
Notes payable – net of debt discount	29,267	28,937
Warrant liabilities	4,742	4,636
Net deferred tax liabilities	4,000	4,720
Other long term liabilities	1,104
Total Liabilities	70,210	70,786
Commitments and Contingencies (Note 17)
Stockholders’ Equity
Common stock $0.001 par value, 750,000,000 shares authorized at March 31, 2019 and December 31, 2018; 217,118,077 and 216,345,984 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	217	216
Additional paid-in capital	679,084	676,373
Accumulated deficit	(531,924)	(509,406)
Accumulated other comprehensive (loss) income	(611)	1,338
Total Stockholders’ Equity	146,766	168,521
Total Liabilities and Stockholders’ Equity	216,976	239,307
Intellectual Property, Net [Member]
Current Assets
Intangible assets	36,322	39,716
In-Process Research and Development [Member]
Current Assets
Intangible assets	$ 10,527	$ 10,747

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Statement Of Partners Capital [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	217,118,077	216,345,984
Common stock, shares outstanding	217,118,077	216,345,984

Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
Balance at Dec. 31, 2017	$ 178,848	$ 199		$ 621,261	$ (447,640)	$ 5,028
Balance, Shares at Dec. 31, 2017		199,282
Stock-based compensation	1,834			1,834
Issuance of common stock and warrants, net of issuance costs	11			11
Exercise of stock options and warrants	2,228	$ 1		2,227
Exercise of stock options and warrants, Shares		1,038
Award of restricted stock units, Shares		367
Return of common stock to pay withholding taxes on restricted stock			$ 174
Cancellation of treasury stock			(174)
Issuance of common stock related to sale of SurgiBot assets	3,000	$ 1		2,999
Issuance of common stock related to sale of SurgiBot assets, Shares		1,286
Cumulative effect of change in accounting principle	11				11
Other comprehensive (loss) income	2,308					2,308
Net loss	(882)				(882)
Balance at Mar. 31, 2018	187,358	$ 201		628,332	(448,511)	7,336
Balance, Shares at Mar. 31, 2018		201,973
Balance at Dec. 31, 2018	168,521	$ 216		676,373	(509,406)	1,338
Balance, Shares at Dec. 31, 2018		216,346
Stock-based compensation	2,981			2,981
Exercise of stock options and warrants	236			236
Exercise of stock options and warrants, Shares		159
Award of restricted stock units	1	$ 1
Award of restricted stock units, Shares		613
Return of common stock to pay withholding taxes on restricted stock	(499)		$ 194	(499)
Cancellation of treasury stock			(194)
Cumulative effect of change in accounting principle				(7)	7
Other comprehensive (loss) income	(1,949)					(1,949)
Net loss	(22,525)				(22,525)
Balance at Mar. 31, 2019	$ 146,766	$ 217		$ 679,084	$ (531,924)	$ (611)
Balance, Shares at Mar. 31, 2019		217,118

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Operating Activities
Net loss	$ (22,525)	$ (882)
Adjustments to reconcile net loss to net cash and cash equivalents used in operating activities:
Loss (gain) from sale of SurgiBot assets, net	97	(11,996)
Depreciation	563	660
Amortization of intangible assets	2,611	2,827
Amortization of debt discount and debt issuance costs	330	274
Amortization of short-term investment discount	(220)
Interest expense on deferred consideration - MST acquisition	204
Stock-based compensation	2,981	1,834
Deferred tax benefit	(610)	(890)
Change in fair value of warrant liabilities	106	(1,829)
Change in fair value of contingent consideration	998	627
Changes in operating assets and liabilities:
Accounts receivable	(129)	(296)
Interest receivable	(8)	(21)
Inventories	(4,621)	(604)
Other current and long term assets	(2,655)	1,171
Accounts payable	286	(217)
Accrued expenses	(2,518)	(2,871)
Deferred revenue	(197)	(86)
Other long term liabilities	1,112
Net cash and cash equivalents used in operating activities	(24,195)	(12,299)
Investing Activities
Purchase of short-term investments	(10,894)
Proceeds from maturities of short-term investments	40,000
Proceeds related to sale of SurgiBot assets, net		4,496
Purchase of property and equipment	(118)	(218)
Proceeds from sale of property and equipment		17
Net cash and cash equivalents provided by investing activities	28,988	4,295
Financing Activities
Proceeds from issuance of common stock and warrants, net of issuance costs		11
Taxes paid related to net share settlement of vesting of restricted stock units	(499)
Proceeds from issuance of common stock related to sale of SurgiBot assets		3,000
Proceeds from exercise of stock options and warrants	236	1,712
Net cash and cash equivalents (used in) provided by financing activities	(263)	4,723
Effect of exchange rate changes on cash and cash equivalents	(58)	88
Net increase (decrease) in cash, cash equivalents and restricted cash	4,472	(3,193)
Cash, cash equivalents and restricted cash, beginning of period	21,651	97,606	$ 97,606
Cash, cash equivalents and restricted cash, end of period	26,123	94,413	$ 21,651
Supplemental Disclosure for Cash Flow Information
Interest paid	750	304
Supplemental Schedule of Noncash Investing and Financing Activities
Transfer of inventories to property and equipment	$ 86	71
Reclass of warrant liability to common stock and additional paid-in capital		$ 516

Organization and Capitalization

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Organization and Capitalization

1.	Organization and Capitalization

TransEnterix, Inc. (the “Company”) is a medical device company that is digitizing the interface between the surgeon and the patient in laparoscopy to increase control and reduce surgical variability in today’s value-based healthcare environment. The Company is focused on the commercialization of the Senhance™ System, which digitizes laparoscopic minimally invasive surgery. The Senhance System allows for robotic precision, haptic feedback, surgeon camera control via eye sensing and improved ergonomics while offering responsible economics.

The Senhance System has a CE Mark in Europe for laparoscopic abdominal and pelvic surgery, as well as limited thoracic operations excluding cardiac and vascular surgery. On October 13, 2017, the Company received 510(k) clearance from the FDA for use of the Senhance System in laparoscopic colorectal and gynecologic surgery. These indications cover 23 procedures, including benign and oncologic procedures. In May 2018, the indications for use expanded when the Company received 510(k) clearance from the FDA for use of the Senhance System in laparoscopic inguinal hernia and laparoscopic cholecystectomy (gallbladder removal) surgery for a total of 28 indicated procedures. The Senhance System is available for sale in the United States, the European Union and select other countries.

The Senhance System is a multi-port robotic surgery system that allows multiple robotic arms to control instruments and a camera. The system features advanced technology to enable surgeons with haptic feedback and the ability to move the camera via eye movement.

On October 31, 2018, the Company acquired the assets, intellectual property and highly experienced multidisciplinary personnel of MST Medical Surgical Technologies, Inc., or MST, an Israeli-based medical technology company. Through this acquisition the Company acquired MST’s AutoLap™ technology, one of the only image-guided robotic scope positioning systems with FDA clearance and CE Mark. The Company believes MST’s image analytics technology will accelerate and drive meaningful Senhance System developments, and allow it to expand the Senhance System to add augmented, intelligent vision capability. See Note 3 for a description of the related transaction.

During 2018 and early 2019, the Company successfully obtained FDA clearance and a CE Mark for 3 millimeter diameter instruments and its Senhance ultrasonic system. The 3 millimeter instruments enable the Senhance System to be used for microlaparoscopic surgeries, allowing for tiny incisions. The ultrasonic system is an advanced energy device used to deliver controlled energy to ligate and divide tissue, while minimizing thermal injury to surrounding structures.

The Company has also developed the SurgiBot System, a single-port, robotically enhanced laparoscopic surgical platform. In December 2017, the Company entered into an agreement with Great Belief International Limited, or GBIL, to advance the SurgiBot System towards global commercialization. The agreement transferred ownership of the SurgiBot System assets, while the Company retained the option to distribute or co-distribute the SurgiBot System outside of China. GBIL intends to have the SurgiBot System manufactured in China and obtain Chinese regulatory clearance from the China Food and Drug Administration while entering into a nationwide distribution agreement with China National Scientific and Instruments and Materials Company for the Chinese market. The agreement provides the Company with proceeds of at least $29.0 million, of which $15.0 million has been received to date. The remaining $14.0 million represents minimum royalties and will be paid beginning at the earlier of receipt of Chinese regulatory approval or March 2023.

On September 18, 2015, the Company entered into a Membership Interest Purchase Agreement, (the “Purchase Agreement”) with Sofar S.p.A., (“Sofar”) as seller, Vulcanos S.r.l. (“Vulcanos”), as the acquired company, and TransEnterix International, Inc. (“TransEnterix International”), a direct, wholly owned subsidiary of the Company which was incorporated in September 2015, as buyer. The closing of the transactions occurred on September 21, 2015 (the “Closing Date”) pursuant to which the Company acquired all of the membership interests of Vulcanos from Sofar (now known as the “Senhance Acquisition”), and changed the name of Vulcanos to TransEnterix Italia S.r.l (“TransEnterix Italia”). The Senhance Acquisition included all of the assets, employees and contracts related to the Senhance System. See Note 3 for a description of the related transactions.

On September 3, 2013, TransEnterix Surgical, Inc. a Delaware corporation (“TransEnterix Surgical”), and SafeStitch Medical, Inc., a Delaware corporation (“SafeStitch”) consummated a merger transaction whereby TransEnterix Surgical merged with a merger subsidiary of SafeStitch, with TransEnterix Surgical as the surviving entity in the merger (the “Merger”). As a result of the Merger, TransEnterix Surgical became a wholly owned subsidiary of SafeStitch. On December 6, 2013, SafeStitch changed its name to TransEnterix, Inc. and increased the authorized shares of common stock from 225,000,000 to 750,000,000, and authorized 25,000,000 shares of preferred stock, par value $0.01 per share.

As used herein, the term “Company” refers to the combination of SafeStitch and TransEnterix Surgical after giving effect to the Merger, and includes TransEnterix International, Inc.; TransEnterix Italia S.r.l.; TransEnterix Europe S.à.R.L; TransEnterix Asia Pte. Ltd.; TransEnterix Taiwan Ltd.; TransEnterix Japan KK and TransEnterix Israel Ltd.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2.	Summary of Significant Accounting Policies

Basis of Presentation

The Company has prepared the accompanying unaudited interim condensed consolidated financial statements in accordance with the instructions to Form 10-Q and the standards of accounting measurement set forth in the Interim Reporting Topic of the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”). Consequently, the Company has not necessarily included in this Form 10-Q all information and footnotes required for audited financial statements. In the opinion of the Company’s management, the accompanying unaudited condensed consolidated financial statements in this Form 10-Q contain all adjustments, consisting only of normal recurring adjustments, except as otherwise indicated, necessary for a fair statement of its financial position, results of operations, and cash flows of the Company for all periods presented. The results reported in these condensed consolidated financial statements should not be regarded as necessarily indicative of results that may be expected for any subsequent period or for the entire year. These unaudited condensed consolidated financial statements and notes thereto should be read in conjunction with the Company’s audited financial statements and the notes thereto included in the Fiscal 2018 Form 10-K. Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with generally accepted accounting principles in the U.S. (“U.S. GAAP”) have been condensed or omitted in the accompanying interim consolidated financial statements. The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by U.S. GAAP. The accompanying Consolidated Financial Statements include the accounts of the Company and its direct and indirect wholly owned subsidiaries, SafeStitch LLC, TransEnterix Surgical, Inc., TransEnterix International, Inc., TransEnterix Italia S.r.l., TransEnterix Europe S.à.R.L; TransEnterix Asia Pte. Ltd.; TransEnterix Taiwan Ltd.; TransEnterix Japan KK and TransEnterix Israel Ltd. All inter-company accounts and transactions have been eliminated in consolidation.

Our financial statements have been presented on the basis that our business is a going concern, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business. We are subject to risks and uncertainties like any business as we try to increase product placements, enhance product offerings, establish long-term license arrangements, create collaborations / strategic alliances and expand into new markets. We have incurred operating losses and negative operating cash flows since inception, and we expect to continue to incur operating losses and negative operating cash flows for at least the next few years. Management has made estimates of future results of operations, using a wide range of assumptions regarding the level of revenue generated, operating expense incurred and future cash flows, which suggest a wide range of possible future outcomes.

With the funds available at March 31, 2019, the Company believes current resources will be sufficient to fund its operations through the next twelve months. The Company believes it has the ability to access additional funding through equity offerings, debt financings / restructuring, and/or other third-party sources to continue as a going concern into the foreseeable future. No assurances can be given that we will ultimately be able to raise sufficient funds through other means to be able to continue operating our business at current levels beyond the next twelve months.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant items subject to such estimates and assumptions include identifiable intangible assets and goodwill, contingent consideration, warrant liabilities, stock compensation expense, revenue recognition, accounts receivable reserves, excess and obsolete inventory reserves, and deferred tax asset valuation allowances.

Cash and Cash Equivalents and Restricted Cash

The Company considers all highly liquid investments with original maturities of 90 days or less at the time of purchase to be cash equivalents.

Restricted cash at March 31, 2019 includes $0.6 million in cash accounts held as collateral primarily under the terms of an office operating lease, credit cards and automobile leases. Restricted cash at December 31, 2018 includes $0.6 million in cash accounts held as collateral primarily under the terms of an office operating lease, credit cards and automobile leases.

Short-term Investments

Short-term investments are considered to be “held-to-maturity” and are carried at amortized cost using the effective interest method. As of March 31, 2019 and December 31, 2018, short-term investments consisted of $22.9 million and $51.8 million, respectively, in U.S. government securities, all of which mature in less than a year.

The Company reassesses the appropriateness of the classification of its investments at the end of each reporting period. The Company has determined that its debt securities should be classified as held-to-maturity as of March 31, 2019 and December 31, 2018. This classification was based upon management’s determination that it has the positive intent and ability to hold the securities until their maturity dates, as the investments mature within 6 months and the underlying cash invested in these securities is not required prior to the investments maturity. Due to the short-term maturities of these instruments, the amortized cost approximates the related fair values, which are based on level 1 inputs as defined in Note 5. As of March 31, 2019 and December 31, 2018, the gross holding gains and losses were immaterial.

The Company reviews its short-term investments for other-than-temporary impairment if the cost exceeds the fair value. No such impairment was recorded as of March 31, 2019 and December 31, 2018.

Concentrations and Credit Risk

The Company’s principal financial instruments subject to potential concentration of credit risk are cash and cash equivalents, including amounts held in money market accounts and short-term investments. The Company places cash deposits with a federally insured financial institution. The Company maintains its cash at banks and financial institutions it considers to be of high credit quality; however, the Company’s cash deposits may at times exceed the Federal Deposit Insurance Corporation’s insured limit. Balances in excess of federally insured limitations may not be insured. The Company’s short-term investments consist of U.S. government securities. The Company has not experienced losses on these accounts, and management believes that the Company is not exposed to significant risks on such accounts.

The Company’s accounts receivable are derived from net revenue to customers located throughout the world. The Company evaluates its customers’ financial condition and, generally, requires no collateral from its customers. The Company provides reserves for potential credit losses but has not experienced significant losses to date. The Company had five customers who constituted 90% of the Company’s net accounts receivable at March 31, 2019. The Company had five customers who constituted 89% of the Company’s net accounts receivable at December 31, 2018. The Company had five customers who accounted for 81% of sales for the three months ended March 31, 2019 and two customers who accounted for 91% of sales for the three months ended March 31, 2018.

Accounts Receivable

Accounts receivable are recorded at net realizable value, which includes an allowance for estimated uncollectable accounts. The allowance for uncollectible accounts was determined based on historical collection experience.

Inventories

Inventories are stated at the lower of cost (determined on a first-in, first-out basis) or net realizable value. Inventory costs include direct materials, direct labor, and normal manufacturing overhead. The Company records reserves, when necessary, to reduce the carrying value of inventory to its net realizable value. Management considers forecast demand in relation to the inventory on hand, competitiveness of product offerings, market conditions and product life cycles when determining excess and obsolescence and net realizable value adjustments. At the point of loss recognition, a new, lower-cost basis for that inventory is established, and any subsequent improvements in facts and circumstances do not result in the restoration or increase in that newly established cost basis.

Identifiable Intangible Assets and Goodwill

Identifiable intangible assets are recorded at cost, or when acquired as part of a business acquisition, at estimated fair value. Certain intangible assets are amortized over 5 to 10 years. Similar to tangible personal property and equipment, the Company periodically evaluates identifiable intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable.

Intellectual property consists of purchased patent rights and developed technology acquired as part of a business acquisition. Amortization of the patent rights is recorded using the straight-line method over the estimated useful life of the patents of 10 years. Amortization of the developed technology is recorded using the straight-line method over the estimated useful life of 5 to 7 years. This method approximates the period over which the Company expects to receive the benefit from these assets. No impairment existed at March 31, 2019 or December 31, 2018.

Indefinite-lived intangible assets, such as goodwill, are not amortized. The Company tests the carrying amounts of goodwill for recoverability on an annual basis at December 31 or when events or changes in circumstances indicate evidence that a potential impairment exists, using a fair value based test. The Company continues to operate in one segment, which is considered to be the sole reporting unit and therefore, goodwill is tested for impairment at the enterprise level. No impairment existed at March 31, 2019 or December 31, 2018.

In-Process Research and Development

In-process research and development (“IPR&D”) assets represent the fair value assigned to technologies that were acquired, which at the time of acquisition have not reached technological feasibility and have no alternative future use. IPR&D assets are considered to be indefinite-lived until the completion or abandonment of the associated research and development projects. During the period that the IPR&D assets are considered indefinite-lived, they are tested for impairment on an annual basis, or more frequently if the Company becomes aware of any events occurring or changes in circumstances that indicate that the fair value of the IPR&D assets are less than their carrying amounts. If and when development is complete, which generally occurs upon regulatory approval, and the Company is able to commercialize products associated with the IPR&D assets, these assets are then deemed definite-lived and are amortized based on their estimated useful lives at that point in time. If development is terminated or abandoned, the Company may have a full or partial impairment charge related to the IPR&D assets, calculated as the excess of carrying value of the IPR&D assets over fair value.

The IPR&D for the Senhance System was acquired on September 21, 2015. On October 13, 2017, upon regulatory approval and the ability to commercialize the products associated with the IPR&D assets, the assets were deemed definite-lived, reclassified to intellectual property and are now amortized based on their estimated useful lives.

The IPR&D from MST was acquired on October 31, 2018.

Property and Equipment

Property and equipment consists primarily of machinery, manufacturing equipment, demonstration equipment, computer equipment, furniture, and leasehold improvements, which are recorded at cost.

Depreciation is recorded using the straight-line method over the estimated useful lives of the assets as follows:

Machinery, manufacturing and demonstration equipment		3-5 years
Computer equipment		3 years
Furniture		5 years
Leasehold improvements		Lesser of lease term or 3 to 10 years

Upon retirement or sale, the cost of assets disposed of and the related accumulated depreciation and amortization are removed from the accounts and any resulting gain or loss is credited or charged to operations. Repairs and maintenance costs are expensed as incurred.

Impairment of Long-Lived Assets

The Company reviews its long-lived assets for possible impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be fully recoverable. To determine the recoverability of its long-lived assets, the Company evaluates the probability that future estimated undiscounted net cash flows will be less than the carrying amount of the assets. If such estimated cash flows are less than the carrying amount of the long-lived assets, then such assets are written down to their fair value. The Company’s estimates of anticipated cash flows and the remaining estimated useful lives of long-lived assets could be reduced in the future, resulting in a reduction to the carrying amount of long-lived assets.

Contingent Consideration

Contingent consideration is recorded as a liability and is the estimate of the fair value of potential milestone payments related to business acquisitions. Contingent consideration is measured at fair value using a discounted cash flow model utilizing significant unobservable inputs including the probability of achieving each of the potential milestones and an estimated discount rate associated with the risks of the expected cash flows attributable to the various milestones. Significant increases or decreases in any of the probabilities of success or changes in expected timelines for achievement of any of these milestones would result in a significantly higher or lower fair value of these milestones, respectively, and commensurate changes to the associated liability. The contingent consideration is revalued at each reporting period and changes in fair value are recognized in the consolidated statements of operations and comprehensive (loss) income.

Warrant Liabilities

The Company’s Series B Warrants (see Note 14) are measured at fair value using a simulation model which takes into account, as of the valuation date, factors including the current exercise price, the expected life of the warrant, the current price of the underlying stock, its expected volatility, holding cost and the risk-free interest rate for the term of the warrant (see Note 5). The warrant liability is revalued at each reporting period and changes in fair value are recognized in the consolidated statements of operations and comprehensive (loss) income. The selection of the appropriate valuation model and the inputs and assumptions that are required to determine the valuation requires significant judgment and requires management to make estimates and assumptions that affect the reported amount of the related liability and reported amounts of the change in fair value. Actual results could differ from those estimates, and changes in these estimates are recorded when known. As the warrant liability is required to be measured at fair value at each reporting date, it is reasonably possible that these estimates and assumptions could change in the near term.

Translation of Foreign Currencies

The functional currency of the Company’s operational foreign subsidiaries is Euros. The assets and liabilities of the Company’s foreign subsidiaries are translated into U.S. dollars at exchange rates in effect at the balance sheet date. Income and expense items are translated at the average exchange rates prevailing during the period. The cumulative translation effect for a subsidiary using a functional currency other than the U.S. dollar is included in accumulated other comprehensive income or loss as a separate component of stockholders’ equity.

The Company’s intercompany accounts are denominated in the functional currency of the foreign subsidiary. Gains and losses resulting from the remeasurement of intercompany receivables that the Company considers to be of a long-term investment nature are recorded as a cumulative translation adjustment in accumulated other comprehensive income or loss as a separate component of stockholders’ equity, while gains and losses resulting from the remeasurement of intercompany receivables from a foreign subsidiary for which the Company anticipates settlement in the foreseeable future are recorded in the consolidated statements of operations and comprehensive (loss) income. The net gains and losses included in net loss in the consolidated statements of operations and comprehensive (loss) income for the three months ended March 31, 2019 and 2018 were not significant.

Business Acquisitions

Business acquisitions are accounted for using the acquisition method of accounting in accordance with Accounting Standards Codification (“ASC”) 805, “Business Combinations.” ASC 805 requires, among other things, that assets acquired and liabilities assumed be recognized at their fair values, as determined in accordance with ASC 820, “Fair Value Measurements,” as of the acquisition date. For certain assets and liabilities, book value approximates fair value. In addition, ASC 805 establishes that consideration transferred be measured at the closing date of the acquisition at the then-current market price. Under ASC 805, acquisition-related costs (i.e., advisory, legal, valuation and other professional fees) and certain acquisition-related restructuring charges impacting the target company are expensed in the period in which the costs are incurred. The application of the acquisition method of accounting requires the Company to make estimates and assumptions related to the estimated fair values of net assets acquired.

Significant judgments are used during this process, particularly with respect to intangible assets. Generally, intangible assets are amortized over their estimated useful lives. Goodwill and other indefinite-lived intangibles are not amortized, but are annually assessed for impairment. Therefore, the purchase price allocation to intangible assets and goodwill has a significant impact on future operating results.

Risk and Uncertainties

The Company is subject to a number of risks similar to other similarly-sized companies in the medical device industry. These risks include, without limitation, the historical lack of profitability; the Company’s ability to raise additional capital; its ability to successfully develop, clinically test and commercialize its products; the timing and outcome of the regulatory review process for its products; changes in the health care and regulatory environments of the United States, Italy, other countries in the European Union, and other countries in which the Company intends to operate; its ability to attract and retain key management, marketing and scientific personnel; competition from new entrants; its ability to successfully prepare, file, prosecute, maintain, defend and enforce patent claims and other intellectual property rights; its ability to successfully transition from a research and development company to a marketing, sales and distribution concern; competition in the market for robotic surgical devices; and its ability to identify and pursue development of additional products.

Revenue Recognition

The Company adopted ASC Topic 606, Revenue from Contracts with Customers (the “New Revenue Standard”), on January 1, 2018. The Company’s revenue consists of product revenue resulting from the sale of systems, system components, instruments and accessories, and service revenue. The Company accounts for a contract with a customer when there is a legally enforceable contract between the Company and the customer, the rights of the parties are identified, the contract has commercial substance, and collectability of the contract consideration is probable. The Company's revenues are measured based on consideration specified in the contract with each customer, net of any sales incentives and taxes collected from customers that are remitted to government authorities.

The Company’s system sale arrangements generally contain multiple products and services. For these bundled sale arrangements, the Company accounts for individual products and services as separate performance obligations if they are distinct, which is if a product or service is separately identifiable from other items in the bundled package, and if a customer can benefit from it on its own or with other resources that are readily available to the customer. The Company’s system sale arrangements include a combination of the following performance obligations: system(s), system components, instruments, accessories, and system service. The Company’s system sale arrangements generally include a five-year period of service. The first year of service is generally free and included in the system sale arrangement and the remaining four years are generally included at a stated service price. The Company considers the service terms in the arrangements that are legally enforceable to be performance obligations. Other than service, the Company generally satisfies all of the performance obligations up-front. System components, system accessories, instruments, accessories, and service are also sold on a standalone basis.

The Company recognizes revenues as the performance obligations are satisfied by transferring control of the product or service to a customer. The Company generally recognizes revenue for the performance obligations as follows:

•

System sales. For systems and system components sold directly to end customers, revenue is recognized when the Company transfers control to the customer, which is generally at the point when acceptance occurs that indicates customer acknowledgment of delivery or installation, depending on the terms of the arrangement. For systems sold through distributors, for which distributors are responsible for installation, revenue is recognized generally at the time of shipment. The Company’s system arrangements generally do not provide a right of return. The systems are generally covered by a one-year warranty. Warranty costs were not material for the periods presented.

•

Instruments and accessories. Revenue from sales of instruments and accessories is recognized when control is transferred to the customers, which generally occurs at the time of shipment, but also occurs at the time of delivery depending on the customer arrangement. Accessory products include sterile drapes used to help ensure a sterile field during surgery, vision products such as replacement endoscopes, camera heads, light guides, and other items that facilitate use of the Senhance System.

•

Service. Service revenue is recognized ratably over the term of the service period as the customers benefit from the service throughout the service period. Revenue related to services performed on a time-and-materials basis is recognized when performed.

For multiple-element arrangements, revenue is allocated to each performance obligation based on its relative standalone selling price. Standalone selling prices are based on observable prices at which the Company separately sells the products or services. Due to limited sales to date, standalone selling prices are not directly observable. The Company estimates the standalone selling price using the market assessment approach considering market conditions and entity-specific factors including, but not limited to, features and functionality of the products and services, geographies, type of customer, and market conditions. The Company regularly reviews standalone selling prices and updates these estimates if necessary.

The following table presents revenue disaggregated by type and geography:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
	(unaudited)
U.S.
Services	$	133	$	21
Total U.S. revenue		133		21

Outside of U.S. ("OUS")
Systems		1,287		3,454
Instruments and accessories		546		1,111
Services		215		181
Total OUS revenue		2,048		4,746

Total
Systems		1,287		3,454
Instruments and accessories		546		1,111
Services		348		202
Total revenue	$	2,181	$	4,767

The Company recognizes sales by geographic area based on the country in which the customer is based.

Transaction price allocated to remaining performance obligations relates to amounts allocated to products and services for which the revenue has not yet been recognized. A significant portion of this amount relates to service obligations performed under the Company's system sales contracts that will be invoiced and recognized as revenue in future periods. Transaction price allocated to remaining performance obligations was approximately $3.8 million as of March 31, 2019.

The Company invoices its customers based on the billing schedules in its sales arrangements. Contract assets for the periods presented primarily represent the difference between the revenue that was recognized based on the relative selling price of the related performance obligations and the contractual billing terms in the arrangements. Contract assets are included in accounts receivable and totaled $0.2 million and $0.1 million as of March 31, 2019 and 2018, respectively. Deferred revenue for the periods presented was primarily related to service obligations, for which the service fees are billed up-front, generally annually. The associated deferred revenue is generally recognized ratably over the service period. The Company did not have any significant impairment losses on its contract assets for the periods presented. Revenue recognized for the three months ended March 31, 2019 and 2018, that was included in the deferred revenue balance at the beginning of each reporting period was $0.3 million and $0.1 million, respectively.

In connection with assets recognized from the costs to obtain a contract with a customer, the Company determined that the sales incentive programs for its sales team do not meet the requirements to be capitalized as the Company does not expect to generate future economic benefits from the related revenue from the initial sales transaction.

Cost of Revenue

Cost of revenue consists of contract manufacturing, materials, labor and manufacturing overhead incurred internally to produce the products. Shipping and handling costs incurred by the Company are included in cost of revenue.

Research and Development Costs

Research and development expenses primarily consist of engineering, product development and regulatory expenses, incurred in the design, development, testing and enhancement of our products. Research and development costs are expensed as incurred.

Stock-Based Compensation

The Company follows ASC 718 “Stock Compensation”, which provides guidance in accounting for share-based awards exchanged for services rendered and requires companies to expense the estimated fair value of these awards over the requisite service period. The Company recognizes compensation expense for stock-based awards based on estimated fair values on the date of grant for awards. The Company uses the Black-Scholes-Merton option pricing model to determine the fair value of stock options. The fair value of restricted stock units is determined by the market price of the Company’s common stock on the date of grant. The expense associated with stock-based compensation is recognized on a straight-line basis over the requisite service period of each award.

The Company records as expense the fair value of stock-based compensation awards, including stock options and restricted stock units. Compensation expense for stock-based compensation was approximately $3.0 million and $1.8 million for the three months ended March 31, 2019 and 2018, respectively.

Income Taxes

The Company accounts for income taxes using the asset and liability method, which requires the recognition of deferred tax assets or liabilities for the temporary differences between financial reporting and tax basis of the Company’s assets and liabilities, and for tax carryforwards at enacted statutory rates in effect for the years in which the asset or liability is expected to be realized. The effect on deferred taxes of a change in tax rates is recognized in income during the period that includes the enactment date. In addition, valuation allowances are established when necessary to reduce deferred tax assets and liabilities to the amounts expected to be realized.

On December 22, 2017, the Tax Cuts and Jobs Act (“Tax Legislation”) was enacted into law, which reduced the U.S. federal corporate income tax rate to 21% for tax years beginning after December 31, 2017. As a result of the newly enacted tax rate, the Company adjusted its U.S. deferred tax assets as of December 31, 2017, by applying the new 21% rate, which resulted in a decrease to the deferred tax assets and a corresponding decrease to the valuation allowance of approximately $36.1 million.

The Tax Legislation also implements a territorial tax system. Under the territorial tax system, in general, the Company's foreign earnings will no longer be subject to tax in the U.S. As part of transition to the territorial tax system the Tax Legislation includes a mandatory deemed repatriation of all undistributed foreign earnings that are subject to a U.S. income tax. The Company has determined that the deemed repatriation applicable to the year ending December 31, 2017 does not result in an additional U.S. income tax liability as it has no undistributed foreign earnings.

The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income (“GILTI”), states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or to provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. The Company has elected to account for GILTI as a period expense in the year the tax is incurred.

Comprehensive (Loss) Income

Comprehensive (loss) income is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources.

Segments

The Company operates in one business segment—the research, development and sale of medical device robotics to improve minimally invasive surgery. The Company’s chief operating decision maker (determined to be the Chief Executive Officer) does not manage any part of the Company separately, and the allocation of resources and assessment of performance are based on the Company’s consolidated operating results. Approximately 47% and 54% of the Company’s total consolidated assets are located within the U.S. as of March 31, 2019 and December 31, 2018, respectively. The remaining assets are mostly located in Europe and are primarily related to the Company’s facility in Italy, and include goodwill, intellectual property, in-process research and development, other current assets, property and equipment, cash, accounts receivable and inventory of $115.5 million and $111.0 million at March 31, 2019 and December 31, 2018, respectively. Total assets outside of the U.S. excluding goodwill amounted to 40% and 34% of total consolidated assets at March 31, 2019 and December 31, 2018, respectively. The Company recognizes sales by geographic area based on the country in which the customer is based. For the three months ended March 31, 2019 and 2018, 6% and 0%, respectively, of net revenue were generated in the United States; 35% and 100% were generated in Europe; and 59% and 0% were generated in Asia.

Impact of Recently Issued Accounting Standards

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. This ASU eliminates, adds and modifies certain disclosure requirements for fair value measurements as part of its disclosure framework project. The standard is effective for all entities for financial statements issued for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently assessing this ASU and has not yet determined the impact ASU 2018-13 may have on its consolidated financial statements.

In June 2018, the FASB issued ASU 2018-07, Compensation-Stock Compensation (Topic 718), Improvements to Nonemployee Share-based Payments. This ASU expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. The Company adopted ASU 2018-07 on January 1, 2019, whereby the accounting for share-based payments for nonemployees and employees will be substantially the same. With the adoption of ASU 2018-07, the Company recorded a charge to accumulated deficit of $7,000.

In July 2017, the FASB issued ASU 2017-11, Earnings Per Share (Topic 260); Distinguishing Liabilities from Equity (Topic 480); Derivatives and Hedging (Topic 815): (Part I) Accounting for Certain Financial Instruments with Down Round Features, (Part II) Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling Interests with a Scope Exception. The amendments in this update are intended to simplify the accounting for certain equity-linked financial instruments and embedded features with down round features that result in the strike price being reduced on the basis of the pricing of future equity offerings. Under the new guidance, a down round feature will no longer need to be considered when determining whether certain financial instruments or embedded features should be classified as liabilities or equity instruments. That is, a down round feature will no longer preclude equity classification when assessing whether an instrument or embedded feature is indexed to an entity's own stock. In addition, the amendments clarify existing disclosure requirements for equity-classified instruments. These amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2018, with early adoption permitted. The adoption of this ASU did not have a material impact on the consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic (842), which establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for most leases. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842), Targeted Improvements, which amends the guidance to add a method of adoption whereby the issuer may elect to recognize a cumulative effect adjustment at the beginning of the period of adoption. ASU 2018-11 Leases (Topic 842), Targeted Improvements, does not require comparative period financial information to be adjusted. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement.

ASU 2016-02 defines a lease as a contract, or part of a contract, that conveys the right to control the use of identified property, plant or equipment for a period of time in exchange for consideration. To determine whether a contract conveys the right to control the use of the identified asset for a period of time, the customer has to have both (1) the right to obtain substantially all of the economic benefits from the use of the identified asset and (2) the right to direct the use of the identified asset, a contract does not contain an identified asset if the supplier has a substantive right to substitute such asset ("the leasing criteria"). As part of the adoption of ASC 842, the Company performed an assessment of the impact the new lease recognition standard will have on its consolidated financial statements. The Company’s leases relate to office equipment, company owned vehicles and corporate offices, all of which are classified as operating leases and include fixed payments. The Company does not have any material leases, individually or in the aggregate, classified as a finance leasing arrangement under the new lease recognition standard.

On January 1, 2019, the Company adopted ASU No. 2016-02, applying the package of practical expedients to leases that commenced before the effective date whereby the Company elected to not reassess the following: (i) whether any expired or existing contracts contain leases; (ii) the lease classification for any expired or existing leases; and (iii) initial direct costs for any existing leases. The Company also elected, for all classes of underlying assets, to not separate nonlease components from lease components and instead to account for them as a single component. The Company elected to apply the transition provisions as of January 1, 2019, the date of adoption, using the effective date approach, and recorded lease ROU assets and related liabilities on its balance sheet without restating prior periods. Many of the Company’s leases include base rental periods coupled with options to renew or terminate the lease, generally at the Company’s discretion. In evaluating the lease term, the Company considers whether renewal is reasonably certain. To the extent a significant economic incentive exists to renew the lease, the option is included within the lease term. Based on the Company’s leases, renewal options generally do not provide a significant economic incentive and are therefore excluded from the lease term. The ROU asset is included in other long term assets on the consolidated balance sheets. The current portion of operating lease liabilities are presented within accrued liabilities while the non-current portion of operating lease liabilities are presented within other long term liabilities on the consolidated balance sheets and represents the present value of the remaining lease payments, discounted using the Company’s incremental borrowing rate, which ranges between 7.0% and 8.5% based on the terms of the lease. The weighted average discount rate as of March 31, 2019 was 8%. There was no change to the Company’s consolidated statements of operations and comprehensive (loss) income or cash flows.

The details of this adjustment are summarized below.


	Balance at		Adjustments Due		Balance at
	December 31, 2018		to ASC 842		January 1, 2019
	(unaudited)
	(In thousands)
Assets
Other long term assets	$	-	$	1,751	$	1,751

Liabilities and Stockholders' Equity
Accrued expenses	$	-	$	507	$	507
Other long term liabilities	$	-	$	1,244	$	1,244

As of March 31, 2019, the right-of-use asset totaled $1.5 million and is included within other long term assets on the consolidated balance sheet and the lease liability totaled $1.8 million, of which $0.7 million is classified as current within accrued expenses and $1.1 million is classified as noncurrent within other long term liabilities on the consolidated balance sheet. Operating lease cost for the three months ended March 31, 2019 totaled $0.3 million and is included within operating expenses in the consolidated statement of operations and comprehensive loss. The weighted average remaining lease term for operating leases as of March 31, 2019 was 2.52 years. Total cash paid for operating leases during the three-month period ended March 31, 2019 was $0.4 million and is included within cash flows from operating activities within the consolidated statement of cash flows.

The following table presents the minimum lease payments as of March 31, 2019 (in thousands):

April 1, 2019 to March 31, 2020	$	959
April 1, 2020 to March 31, 2021		518
April 1, 2021 to March 31, 2022		441
April 1, 2022 to March 31, 2023		119
April 1, 2023 to March 31, 2024		18
Total minimum lease payments		2,055
Less: Amount of lease payments representing interest		(218	)
Present value of future minimum lease payments	$	1,837

Acquisitions

3 Months Ended

Mar. 31, 2019

Business Combinations [Abstract]

Acquisitions

3.	Acquisitions

MST Medical Surgery Technologies Ltd. Acquisition

On September 23, 2018, the Company entered into an Asset Purchase Agreement (the “MST Purchase Agreement”) with MST Medical Surgery Technologies Ltd., an Israeli private company (the “Seller”), and two of the Company’s wholly owned subsidiaries, as purchasers of the assets of the Seller, including the intellectual property assets (collectively, the “Buyers”). The closing of the transactions occurred on October 31, 2018, pursuant to which the Company acquired the Seller’s assets consisting of intellectual property and tangible assets related to surgical analytics with its core image analytics technology designed to empower and automate the surgical environment, with a focus on medical robotics and computer-assisted surgery. The core technology acquired under the MST Purchase Agreement is a software-based image analytics information platform powered by advanced visualization, scene recognition, artificial intelligence, machine learning and data analytics.

Under the terms of the MST Purchase Agreement, at the closing the Buyers purchased substantially all of the assets of the Seller. The acquisition price consisted of two tranches. At or prior to the closing of the transaction the Buyers paid $5.8 million in cash and the Company issued 3.15 million shares of the Company’s common stock. A second tranche of $6.6 million in additional consideration will be payable in cash, stock or cash and stock, at the discretion of the Company, within one year after the closing date.

The MST Purchase Agreement contains customary representations and warranties of the parties and the parties have customary indemnification obligations, which are subject to certain limitations described further in the MST Purchase Agreement.

In connection with the closing under the MST Purchase Agreement (the “MST Acquisition”), the Company and the Seller entered into a Lock-Up Agreement, dated October 31, 2018, pursuant to which the Seller agreed, subject to certain exceptions, not to sell, transfer or otherwise convey any of the shares of Company common stock (the “Securities Consideration”) for six months following the Closing Date. The Lock-Up Agreement further provides that the Seller may sell, transfer or convey: (i) no more than 50% of the Securities Consideration during the period commencing on the six-month anniversary of the Closing Date and ending on the twelve-month anniversary of the Closing Date; and (ii) no more than 75% of the Securities Consideration during the period commencing on the twelve-month anniversary of the Closing Date and ending on the eighteen-month anniversary of the Closing Date. The restrictions on transfer contained in the Lock-Up Agreement cease to apply to the Securities Consideration following the eighteen-month anniversary of the closing date of the MST Acquisition, or earlier upon certain other conditions. The Lock-Up Agreement further provides that the Seller may not sell, transfer or convey the additional consideration, if such additional consideration is paid in whole or in part through the issuance of shares of the Company’s common stock, until after the six-month anniversary of the issuance of the Company’s common stock as additional consideration, or earlier upon certain other conditions.

In connection with the MST Acquisition closing, the Company also entered into a Registration Rights Agreement, dated as of October 31, 2018, with the Seller, pursuant to which the Company agreed to register the Securities Consideration such that such Securities Consideration is eligible for resale following the end of the lock-up periods described above.

The MST Purchase Agreement was accounted for as a business combination utilizing the methodology prescribed in ASC 805. The purchase price for the acquisition was allocated to the assets acquired and liabilities assumed based on their estimated fair values.

The following table summarizes the acquisition date fair value of the consideration (in thousands).

Stock consideration	$	8,300
Cash consideration		5,800
Present value of deferred consideration		5,900
Other consideration		314
Total consideration	$	20,314

The value of the stock consideration was determined based on the fair value of the stock on the closing date, adjusted for a lack of marketability discount related to the Lock-Up Agreement. The value of the deferred consideration was determined based on the present value of the future payment using a market interest rate.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed on October 31, 2018, the date of acquisition (in thousands):

Property and equipment	$	43
In-process research and development		10,633
Goodwill		9,638
Net assets acquired	$	20,314

The Company allocated $10.6 million of the purchase price to identifiable intangible assets of in-process research and development that met the separability and contractual legal criterion of ASC 805. IPR&D is principally the estimated fair value of the MST technology which had not reached commercial technological feasibility nor had alternative future use at the time of the acquisition and therefore the Company considered IPR&D, with assigned values to be allocated to the IPR&D assets acquired.

Goodwill is calculated as the difference between the acquisition-date fair value of the consideration transferred and the fair values of the assets acquired and liabilities assumed. The goodwill resulting from this acquisition arises largely from synergies expected from combining the intellectual property acquired from MST with the Company’s existing intellectual property as well as acquired employees. The goodwill is deductible for income tax purposes.

No revenue and a net loss of $0.6 million associated with MST’s operations are included in the consolidated financial statements for the three months ended March 31, 2019.

Senhance Surgical Robotic System

On September 21, 2015, the Company completed the strategic acquisition, through its wholly owned subsidiary TransEnterix International, from Sofar, of all of the assets, employees and contracts related to the advanced robotic system for minimally invasive laparoscopic surgery now known as the Senhance System.

Under the terms of the Purchase Agreement, the consideration consisted of the issuance of 15,543,413 shares of the Company’s common stock (the “Securities Consideration”) and approximately $25.0 million U.S. Dollars and €27.5 million Euro in cash consideration (the “Cash Consideration”). On December 30, 2016, the Company and Sofar entered into an Amendment to the Purchase Agreement (the “Amendment”) to restructure the terms of the second tranche of the Cash Consideration (the “Second Tranche”). The initial Securities Consideration was issued in full at the closing of the Senhance Acquisition; under the Amendment, the second tranche of the Cash Consideration was restructured, and an additional issuance of 3,722,685 shares of the Company’s common stock with an aggregate fair market value of €5.0 million occurred in January 2017. Following the Amendment, he total Cash Consideration was $25.0 million U.S. Dollars and approximately €22.5 million Euro, of which all but €15.1 million has been paid as of March 31, 2019. The majority of the remaining Cash Consideration to be paid is the third tranche of the Cash Consideration (the “Third Tranche”) of €15.0 million which shall be payable upon achievement of trailing revenues from sales or services contracts of the Senhance System of at least €25.0 million over a calendar quarter. The Third Tranche payments will be accelerated in the event that (i) the Company or TransEnterix International is acquired, (ii) the Company significantly reduces or suspends selling efforts of the Senhance System, or (iii) the Company acquires a business that offers alternative products that are directly competitive with the Senhance System.

The Purchase Agreement contains customary representations and warranties of the parties and the parties have customary indemnification obligations, which are subject to certain limitations described further in the Purchase Agreement.

The Senhance Acquisition was accounted for as a business combination utilizing the methodology prescribed in ASC 805. The purchase price for the Senhance Acquisition was allocated to the assets acquired and liabilities assumed based on their estimated fair values.

Cash, Cash Equivalents, and Restricted Cash

3 Months Ended

Mar. 31, 2019

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]

Cash, Cash Equivalents, and Restricted Cash

4.	Cash, Cash Equivalents, and Restricted Cash

Restricted cash at March 31, 2019 and December 31, 2018 includes $0.6 million in cash accounts held as collateral primarily under the terms of an office operating lease, credit card agreement and automobile leases.

Fair Value

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value

5.	Fair Value

The Company held certain assets and liabilities that are required to be measured at fair value on a recurring basis. These assets and liabilities include cash and cash equivalents, restricted cash, contingent consideration and warrant liabilities. ASC 820-10 (“Fair Value Measurement Disclosure”) requires the valuation using a three-tiered approach, which requires that fair value measurements be classified and disclosed in one of three tiers. These tiers are: Level 1, defined as quoted prices in active markets for identical assets or liabilities; Level 2, defined as valuations based on observable inputs other than those included in Level 1, such as quoted prices for similar assets and liabilities in active markets, or other inputs that are observable or can be corroborated by observable input data; and Level 3, defined as valuations based on unobservable inputs reflecting the Company’s own assumptions, consistent with reasonably available assumptions made by other market participants. The Company did not have any transfers of assets and liabilities between Level 1, Level 2, and Level 3 of the fair value hierarchy during the three months March 31, 2019 and the year ended December 31, 2018.

For assets and liabilities recorded at fair value, it is the Company’s policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements, in accordance with the fair value hierarchy. Fair value measurements for assets and liabilities where there exists limited or no observable market data and therefore, are based primarily upon estimates, are often calculated based on the economic and competitive environment, the characteristics of the asset or liability and other factors. Therefore, the results cannot be determined with precision and may not be realized in an actual sale or immediate settlement of the asset or liability. Additionally, there may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results of current or future values. The Company utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures.

As prescribed by U.S. GAAP, the Company groups assets and liabilities at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. An adjustment to the pricing method used within either Level 1 or Level 2 inputs could generate a fair value measurement that effectively falls in a lower level in the hierarchy.

The determination of where an asset or liability falls in the hierarchy requires significant judgment. The Company evaluates its hierarchy disclosures and based on various factors, it is possible that an asset or liability may be classified differently from period to period. However, the Company expects changes in classifications between levels will be rare.

The carrying values of accounts receivable, short-term investments, interest receivable, accounts payable, and certain accrued expenses at March 31, 2019 and December 31, 2018, approximate their fair values due to the short-term nature of these items. The Company’s notes payable balance also approximates fair value as of March 31, 2019 and December 31, 2018, as the interest rates on the notes payable approximate the rates available to the Company as of these dates.

The following are the major categories of assets measured at fair value on a recurring basis as of March 31, 2019 and December 31, 2018, using quoted prices in active markets for identical assets (Level 1); significant other observable inputs (Level 2); and significant unobservable inputs (Level 3):

	March 31, 2019
	(In thousands)
	(unaudited)
Description	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets measured at fair value
Cash and cash equivalents	$	25,545	$	—	$	—	$	25,545
Restricted cash		578		—		—		578
Total Assets measured at fair value	$	26,123	$	—	$	—	$	26,123
Liabilities measured at fair value
Contingent consideration	$	—	$	—	$	11,635	$	11,635
Warrant liabilities		—		—	$	4,742	$	4,742
Total liabilities measured at fair value	$	—	$	—	$	16,377	$	16,377

	December 31, 2018
	(In thousands)
Description	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets measured at fair value
Cash and cash equivalents	$	21,061	$	—	$	—	$	21,061
Restricted cash		590		—		—		590
Total Assets measured at fair value	$	21,651	$	—	$	—	$	21,651
Liabilities measured at fair value
Contingent consideration	$	—	$	—	$	10,637	$	10,637
Warrant liabilities		—		—		4,636		4,636
Total liabilities measured at fair value	$	—	$	—	$	15,273	$	15,273

The Company’s financial liabilities consisted of contingent consideration potentially payable to Sofar related to the Senhance Acquisition in September 2015 (Note 3). This liability is reported as Level 3 as estimated fair value of the contingent consideration related to the acquisition requires significant management judgment or estimation and is calculated using the income approach, using various revenue and cost assumptions and applying a probability to each outcome. The change in fair value of the contingent consideration of $1.0 million for the three months ended March 31, 2019 was primarily due to the passage of time. The change in fair value of the contingent consideration of $0.6 million for the three months ended March 31, 2018 was primarily due to the passage of time on the fair value measurement and the impact of foreign currency exchange rates. Adjustments associated with the change in fair value of contingent consideration are included in the Company’s consolidated statements of operations and comprehensive (loss) income.

On April 28, 2017, the Company sold 24.9 million units (the “Units”), each consisting of one share of the Company’s Common Stock, a Series A warrant to purchase one share of Common Stock with an exercise price of $1.00 per share (the “Series A Warrants”), and a Series B warrant to purchase 0.75 shares of Common Stock with an exercise price of $1.00 per Unit (the “Series B Warrants,” together with the Series A Warrants, the “Warrants”), at an offering price of $1.00 per Unit. Each Series A Warrant was exercisable at any time beginning on the date of issuance, and from time to time thereafter, through and including the first anniversary of the issuance date, unless terminated earlier as provided in the Series A Warrant. Receipt of 510(k) clearance for the Senhance System on October 13, 2017 triggered the acceleration of the expiration date of the Series A Warrants to October 31, 2017. Each Series B Warrant may be exercised at any time beginning on the date of issuance and from time to time thereafter through and including the fifth anniversary of the issuance date.

The fair value of the Series A Warrants of $2.5 million at the date of issuance was estimated using the Black-Scholes Merton model which used the following inputs: term of 1 year, risk free rate of 1.07%, no dividends, volatility of 73.14%, and share price of $0.65 per share based on the trading price of the Company’s Common Stock. All Series A Warrants were exercised as of December 31, 2017.

The change in fair value of all outstanding Series B Warrants for the three months ended March 31, 2019 and 2018 of an increase of $0.1 million and a decrease of $1.8 million, respectively, was included in the Company’s consolidated statements of operations and comprehensive (loss) income. The following table presents the inputs and valuation methodologies used for the Company’s fair value of the Series B Warrants:

					April 28, 2017
Series B	March 31, 2019		December 31, 2018		(date of issuance)
Fair value	$4.7 million		$4.6 million		$6.2 million
Valuation methodology	Monte Carlo		Monte Carlo		Black-Scholes Merton
Term	3.08 years		3.32 years		5 years
Risk free rate	2.21%		2.47%		1.81%
Dividends		—		—		—
Volatility	82.37%		87.60%		73.14%
Share price	$	2.38	$	2.26	$	0.65
Probability of additional financing	100% in 2019		100% in 2019		Not Applicable

The following table presents quantitative information about the inputs and valuation methodologies used for the Company’s fair value measurements classified in Level 3 with the exception of the warrant liability, which is explained above as of March 31, 2019 and December 31, 2018:

Valuation

Methodology

Significant

Unobservable Input

Weighted Average

(range, if

applicable)

Contingent consideration

Probability weighted

income approach

Milestone dates

2019 to 2022

Discount rate

10% to 12%

The following table summarizes the change in fair value, as determined by Level 3 inputs, for all assets and liabilities using unobservable Level 3 inputs for the three months ended March 31, 2019:

	Fair Value Measurement at Reporting Date (Level 3)
	(In thousands)
	(unaudited)
	Common stock		Contingent
	warrants		consideration
Balance at December 31, 2018	$	4,636	$	10,637
Change in fair value		106		998
Balance at March 31, 2019	$	4,742	$	11,635
Current portion		—		70
Long-term portion		4,742		11,565
Balance at March 31, 2019	$	4,742	$	11,635

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Accounts Receivable, Net

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Accounts Receivable, Net

6.	Accounts Receivable, Net

The following table presents the components of accounts receivable:

	March 31,			December 31,
	2019			2018
	(In thousands)
	(unaudited)
Gross accounts receivable	$	8,610		$	8,640
Allowance for uncollectible accounts		(79	)		(80	)
Total accounts receivable, net	$	8,531		$	8,560

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Inventories

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Inventories

7.	Inventories

The components of inventories are as follows:

	March 31,		December 31,
	2019		2018
	(In thousands)
	(unaudited)
Finished goods	$	6,471	$	5,439
Raw materials		8,726		5,502
Total inventories	$	15,197	$	10,941

Other Current Assets

3 Months Ended

Mar. 31, 2019

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other Current Assets

8.	Other Current Assets

The following table presents the components of other current assets:

	March 31,		December 31,
	2019		2018
	(In thousands)
	(unaudited)
Advances to vendors	$	8,578	$	7,758
Prepaid expenses		1,593		1,438
Other receivables		40		9
Total	$	10,211	$	9,205

Property and Equipment

3 Months Ended

Mar. 31, 2019

Property Plant And Equipment [Abstract]

Property and Equipment

9.	Property and Equipment

Property and equipment consisted of the following:

	March 31,			December 31,
	2019			2018
	(In thousands)
	(unaudited)
Machinery, manufacturing and demonstration equipment	$	12,425		$	12,320
Computer equipment		2,297			2,260
Furniture		635			639
Leasehold improvements		2,272			2,280
Total property and equipment		17,629			17,499
Accumulated depreciation and amortization		(11,706	)		(11,162	)
Property and equipment, net	$	5,923		$	6,337

Depreciation expense was approximately $0.6 million and $0.7 million, for the three months ended March 31, 2019 and 2018, respectively.

Goodwill, In-Process Research and Development and Intellectual Property

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill, In-Process Research and Development and Intellectual Property

10.	Goodwill, In-Process Research and Development and Intellectual Property

Goodwill

Goodwill of $93.8 million was recorded in connection with the Merger, as described in Note 1, goodwill of $38.3 million was recorded in connection with the Senhance Acquisition, as described in Note 3, and goodwill of $9.6 million was recorded in connection with the MST Acquisition, as described in Note 3. The carrying value of goodwill and the change in the balance for the three months ended March 31, 2019 is as follows:

	Goodwill
	(In thousands)
	(unaudited)
Balance at December 31, 2018	$	80,131
Foreign currency translation impact		(622	)
Balance at March 31, 2019	$	79,509

Accumulated impairment of goodwill as of March 31, 2019 and December 31, 2018 was $61.8 million.

No impairment was recorded as of March 31, 2019 and December 31, 2018. No impairment was recorded during the three months ended March 31, 2019 or 2018.

In-Process Research and Development

As described in Note 3, on October 31, 2018, the Company acquired the assets from MST and recorded $10.6 million of IPR&D. The estimated fair value of the IPR&D was determined using a probability-weighted income approach, which discounts expected future cash flows to present value. The projected cash flows were based on certain key assumptions, including estimates of future revenue and expenses, taking into account the stage of development of the technology at the acquisition date and the time and resources needed to complete development. The Company used a discount rate of 15% and cash flows that have been probability adjusted to reflect the risks of product integration, which the Company believes are appropriate and representative of market participant assumptions.

On October 13, 2017, upon receipt of regulatory clearance to commercialize the products associated with the IPR&D assets in the United States, the assets were deemed definite-lived, transferred to developed technology and are amortized based on their estimated useful lives.

The carrying value of the Company’s IPR&D assets and the change in the balance for the three months ended March 31, 2019 is as follows:

	In-Process Research and Development
	(In thousands)
	(unaudited)
Balance at December 31, 2018	$	10,747
Foreign currency translation impact		(220	)
Balance at March 31, 2019	$	10,527

Intellectual Property

As described in Note 3, on September 21, 2015, the Company acquired all of the developed technology related to the Senhance System and recorded $48.5 million of intellectual property. The estimated fair value of the intellectual property was determined using a probability-weighted income approach, which discounts expected future cash flows to present value. The projected cash flows were based on certain key assumptions, including estimates of future revenue and expenses, taking into account the stage of development of the technology at the acquisition date and the time and resources needed to complete development. The Company used a discount rate of 45% and cash flows that have been probability adjusted to reflect the risks of product commercialization, which the Company believes are appropriate and representative of market participant assumptions.

As described in Note 3, on September 21, 2015, the Company acquired all of the assets related to the Senhance System and recorded $17.1 million of IPR&D. The estimated fair value of the IPR&D was determined using a probability-weighted income approach, which discounts expected future cash flows to present value. The projected cash flows were based on certain key assumptions, including estimates of future revenue and expenses, taking into account the stage of development of the technology at the acquisition date and the time and resources needed to complete development. The Company used a discount rate of 45% and cash flows that have been probability adjusted to reflect the risks of product commercialization, which the Company believes are appropriate and representative of market participant assumptions. On October 13, 2017, upon regulatory approval and the ability to commercialize the products associated with the IPR&D assets, the assets were deemed definite-lived, reclassified to intellectual property and are now being amortized based on their estimated useful lives.

In November 2016, the Company agreed to enter into a technology and patents purchase agreement with Sofar to acquire from Sofar certain technology and intellectual property rights related to the Senhance Acquisition, and formerly licensed by the Company. The technology and patents were acquired in 2017 at an acquisition price of $0.4 million.

The components of gross intellectual property, accumulated amortization, and net intellectual property as of March 31, 2019 and December 31, 2018 are as follows:

	March 31, 2019									December 31, 2018
	(In thousands)									(In thousands)
	(unaudited)
	Gross Carrying Amount		Accumulated Amortization			Foreign currency translation impact		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Foreign currency translation impact		Net Carrying Amount
Developed technology	$	66,413	$	(33,151	)	$	2,720	$	35,982	$	66,413	$	(30,550	)	$	3,495	$	39,358
Technology and patents purchased		400		(82	)		22	$	340		400		(72	)		30		358
Total intellectual property	$	66,813	$	(33,233	)	$	2,742	$	36,322	$	66,813	$	(30,622	)	$	3,525	$	39,716

The weighted average remaining useful life of the developed technology and technology and patents purchased was 3.5 years and 8.1 years, respectively as of March 31, 2019. The weighted average remaining useful life of the developed technology and technology and patents purchased was 3.8 years and 8.3 years, respectively as of December 31, 2018.

Income Taxes

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

11.	Income Taxes

Income taxes have been accounted for using the asset and liability method in accordance with ASC 740 “Income Taxes”. The Company computes its interim provision for income taxes by applying the estimated annual effective tax rate method. The Company estimates an annual effective tax rate of 4.6% for the year ending December 31, 2019. This rate does not include the impact of any discrete items. The Company incurred losses for the three month period ended March 31, 2019 and is forecasting additional losses through the year, resulting in an estimated net loss for both financial statement and tax purposes for the year ending December 31, 2019. Due to the Company’s history of losses, there is not sufficient evidence to record a net deferred tax asset associated with the U.S., Luxembourg, Swiss, and Asian operations. Accordingly, a full valuation allowance has been recorded related to the net deferred tax asset in those jurisdictions. The Swiss jurisdiction has indefinite-lived intangibles that create deferred tax liabilities which cannot be offset against the deferred tax assets, resulting in a net deferred tax liability recorded in that jurisdiction. There is no net deferred tax asset recorded in relation to TransEnterix Italia and accordingly no valuation allowance has been recorded in that jurisdiction. The deferred tax benefit during the three months ended March 31, 2019 and 2018, was approximately $0.6 million and $0.9 million, respectively. The Israeli jurisdiction was profitable through March 31, 2019 and is projected to be profitable for the year ending December 31, 2019. Consequently, $0.02 million of current tax expense was recorded during the three months ended March 31, 2019 for this jurisdiction.

The Company’s effective tax rate for each of the three month periods ended March 31, 2019 and 2018 was 2.6% and 50.2%, respectively. At March 31, 2019, the Company had no unrecognized tax benefits that would affect the Company’s effective tax rate.

The Tax Legislation subjects a U.S. shareholder to tax on global intangible low-taxed income (“GILTI”) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or to provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. Because the Company was evaluating the provision of GILTI as of December 31, 2017, no GILTI-related deferred amounts were recorded in 2017. The Company has elected to account for GILTI in the year the tax is incurred. The Company does not expect a GILTI inclusion for 2018 or 2019; no GILTI tax has been recorded for the three months ending March 31, 2019 or 2018.

Accrued Expenses

3 Months Ended

Mar. 31, 2019

Accrued Liabilities Current [Abstract]

Accrued Expenses

12.	Accrued Expenses

The following table presents the components of accrued expenses:

	March 31,		December 31,
	2019		2018
	(In thousands)
	(unaudited)
Compensation and benefits	$	2,125	$	6,225
Consulting and other vendors		1,933		895
Other		646		539
Lease liability		733		—
Royalties		365		498
Legal and professional fees		380		432
Deferred rent		—		391
Taxes and other assessments		602		383
Interest		260		256
Total	$	7,044	$	9,619

Notes Payable

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Notes Payable

13.	Notes Payable

On May 23, 2018, the Company and its domestic subsidiaries, as co-borrowers, entered into a Loan and Security Agreement (the “Hercules Loan Agreement”) with several banks and other financial institutions or entities from time to time party to the Loan Agreement (collectively, the “Lender”) and Hercules Capital, Inc., as administrative agent and collateral agent (the “Agent”). Under the Hercules Loan Agreement, the Lender has agreed to make certain term loans to the Company in the aggregate principal amount of up to $40.0 million, with funding of the first $20.0 million tranche occurring on May 23, 2018 (the “Initial Funding Date”). On October 23, 2018, the Lender funded the second tranche of $10.0 million under the Hercules Loan Agreement. The Company is entitled to make interest-only payments until December 1, 2020, and at the end of the interest-only period, the Company will be required to repay the term loans over an eighteen-month period based on an eighteen-month amortization schedule, with a final maturity date of June 1, 2022. The term loans will be required to be repaid if the term loans are accelerated following an event of default. As further described in Note 18, the Company amended the Hercules Loan Agreement to eliminate the availability of the Tranche III loan facility, add a new Tranche IV loan facility of up to $20.0 million, revise certain financial covenants and make other changes.

The term loans bear interest at a rate equal to the greater of (i) 9.55% per annum (the “Fixed Rate”) and (ii) the Fixed Rate plus the prime rate (as reported in The Wall Street Journal) minus 5.00%. Following the draw of the third tranche, the Fixed Rate will be reduced to 9.20% effective on the first interest payment date to occur during the first fiscal quarter following the draw of the third tranche. On the Initial Funding Date, the Company was obligated to pay a facility fee of $0.4 million, recorded as a debt discount. The Company also incurred other debt issuance costs totaling $1.1 million in conjunction with its entry into the Hercules Loan Agreement. In addition, the Company is permitted to prepay the term loans in full at any time, with a prepayment fee of 3.0% of the outstanding principal amount of the loan in the first year after the Initial Funding Date, 2.0% if the prepayment occurs in the second year after the Initial Funding Date and 1.0% thereafter. Upon prepayment of the term loans in full or repayment of the terms loans at the maturity date or upon acceleration, the Company is required to pay a final fee of 6.95% of the aggregate principal amount of term loans funded. The final payment fee is accreted to interest expense over the life of the term loan and included within notes payable on the consolidated balance sheet.

The Company’s obligations under the Hercules Loan Agreement are guaranteed by all current and future material foreign subsidiaries of the Company and are secured by a security interest in all of the assets of the Company and their current and future domestic subsidiaries and all of the assets of their current and future material foreign subsidiaries, including a security interest in the intellectual property. The Hercules Loan Agreement contains customary representations and covenants that, subject to exceptions, restrict the Company’s and its subsidiaries’ ability to do the following, among other things: declare dividends or redeem or repurchase equity interests; incur additional indebtedness and liens; make loans and investments; engage in mergers, acquisitions, and asset sales; transact with affiliates; undergo a change in control; add or change business locations; and engage in businesses that are not related to its existing business. Under the terms of the Hercules Loan Agreement, the Company is required to maintain cash and/or investment property in accounts which perfect the Agent’s first priority security interest in such accounts in an amount equal to the lesser of (i) (x) 120% of the then-outstanding principal balance of the term loans, including accrued interest and any other fees payable under the agreement to the extent accrued and payable plus (y) an amount equal to the then-outstanding accounts payable of the Company on a consolidated basis that are more than 90 days past due and (ii) 80% of the aggregate cash of the Company and its consolidated subsidiaries. As of March 31, 2019, the Company was in compliance with its debt covenants. The Agent is granted the option to invest up to $2.0 million in any future equity offering broadly marketed by the Company to investors on the same terms as the offering to other investors.

In connection with its entrance into the Hercules Loan Agreement, the Company repaid its existing loan and security agreement (the “Innovatus Loan Agreement”) with Innovatus Life Sciences Lending Fund I, LP (“Innovatus”). The Company recognized a loss of $1.4 million on the extinguishment of notes payable which is included in interest expense on the consolidated statement of operations and comprehensive loss for the year ended December 31, 2018. The Company paid $0.7 million in final payment obligations and $0.3 million in prepayment fees under the Innovatus Loan Agreement upon repayment.

Under the Innovatus Loan Agreement, entered into on May 10, 2017, Innovatus agreed to make certain term loans in the aggregate principal amount of up to $17.0 million. Funding of the first $14.0 million tranche occurred on May 10, 2017.

The Innovatus Loan Agreement allowed for interest-only payments for up to twenty-four months at a fixed rate equal to 11% per annum, of which 2.5% could be paid in-kind and added to the outstanding principal amount of the term loans until the earlier of (i) the first anniversary following the funding date and (ii) the Company’s failure to achieve an Interest-Only Milestone. At the end of the interest-only period, the Company would be required to repay the term loans over a two-year period, based on a twenty-four (24) month amortization schedule, with a final maturity date of May 10, 2021.

In connection with the Innovatus funding, the Company paid a facility fee of $0.2 million on the date of funding of the first tranche and incurred additional debt issuance costs of approximately $1.2 million, recorded as a debt discount. In addition, the Company issued warrants to Innovatus to purchase shares of the Company’s common stock that will expire five (5) years from such issue date. The warrants issued in connection with funding of the first tranche entitle Innovatus to purchase up to 1,244,746 shares of the Company’s common stock at an exercise price of $1.00 per share. The Company estimated the fair value of the warrants to be $0.3 million. The value of the warrants was classified as equity and recorded as a discount to the loan. The debt discount was amortized as interest expense using the effective interest method over the life of the loan. As of December 31, 2018, the unamortized debt discount was $0.

In connection with its entrance into the Innovatus Loan Agreement, the Company repaid its then-existing credit facility with Silicon Valley Bank and Oxford Finance LLC, which loan and security agreement, as subsequently amended and restated is referred to as the “SVB Loan Agreement.” The Company recognized a loss of $0.3 million on the extinguishment of notes payable which is included in interest expense on the consolidated statement of operations and comprehensive loss for the year ended December 31, 2017. The Company paid $1.3 million in final payment obligations and $0.3 million in facility fees under the SVB Loan Agreement upon repayment.

In connection with the issuance of the notes payable and amendments under the SVB Loan Agreement, the Company incurred approximately $0.4 million in debt issuance costs paid to Silicon Valley Bank and Oxford Finance and third parties and $0.3 million in debt issuance costs related to issuance of warrants to such Prior Lenders. The unamortized balance of $0.1 million as of December 31, 2016, was amortized using the effective interest method, until the debt was extinguished in May 2017. At the time of extinguishment in May 2017, $0.1 million of unamortized debt issuance costs were included in the loss on extinguishment of notes payable.

Warrants

3 Months Ended

Mar. 31, 2019

Text Block [Abstract]

Warrants

14.

Warrants

The following table summarizes the change in warrants for the three months ended March 31, 2019:

					Weighted
			Weighted		Average
			Average		Remaining		Weighted
	Number of		Exercise		Contractual		Average
	Warrants		Price		Life (in years)		Fair Value
Outstanding at December 31, 2018		4,329,437	$	1.03		3.7	$	0.26
Exercised		—		—		—		—
Expired		—		—		—		—
Outstanding at March 31, 2019		4,329,437	$	1.03		3.5	$	0.26

Purchase Agreement, Controlled Equity Offering and Public Offering of Common Stock

3 Months Ended

Mar. 31, 2019

Purchase Agreement Controlled Equity Offering And Public Offering Of Common Stock [Abstract]

Purchase Agreement, Controlled Equity Offering and Public Offering of Common Stock

15.	Purchase Agreement, Controlled Equity Offering and Public Offering of Common Stock

On December 28, 2018, the Company entered into an At-the-Market Equity Offering Sales Agreement (the “2018 Sales Agreement”) with Stifel, as sales agent, pursuant to which the Company can sell through Stifel, from time to time, up to $75.0 million in shares of common stock in an at-the-market offering. All sales of shares will be made pursuant to an effective shelf registration statement on Form S-3 filed with the SEC. The Company pays Stifel a commission of approximately 3% of the aggregate gross proceeds received from all sales of common stock under the 2018 Sales Agreement. Unless otherwise terminated earlier, the 2018 Sales Agreement continues until all shares available under the Sales Agreement have been sold or termination of the 2018 Sales Agreement by the Company or by Stifel. As of March 31, 2019, there were no sales of common stock under the 2018 Sales Agreement.

On April 28, 2017, the Company sold 24.9 million units, each consisting of one share of the Company’s common stock, a Series A warrant to purchase one share of common stock, and a Series B warrant to purchase 0.75 shares of common stock, at a public offering price of $1.00 per unit for aggregate gross proceeds of $24.9 million in an underwritten firm commitment public offering. Net proceeds after issuance costs were $23.2 million, assuming no exercise of the warrants. The closing of the public offering occurred on May 3, 2017.

On August 31, 2017, the Company entered into an At-the-Market Equity Offering Sales Agreement (the “2017 Sales Agreement”) with Stifel, Nicolaus & Company, Incorporated (“Stifel”), as sales agent, pursuant to which the Company sold through Stifel, up to $50.0 million in shares of common stock in an at-the-market offering. The Company paid Stifel a commission of approximately 3% of the aggregate gross proceeds received from all sales of common stock under the 2017 Sales Agreement.

The amounts offered and sold under the 2017 Sales Agreement are as set forth below (in thousands, except per share amounts):

	2017 Sales Agreement
	Year Ended December 31, 2017
Total shares of common stock sold		15,998.5
Average price per share	$	3.13
Gross proceeds	$	50,000
Commissions earned by Cantor	$	1,500
Other issuance costs	$	97

Basic and Diluted Net Loss per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Basic and Diluted Net Loss per Share

16.	Basic and Diluted Net Loss per Share

Basic net loss per common share is computed by dividing net loss attributable to common stockholders by the weighted average number of common shares outstanding during the period. Diluted net loss per common share is computed giving effect to all dilutive potential common shares that were outstanding during the period. Diluted potential common shares consist of incremental shares issuable upon exercise of stock options, warrants and restricted stock units. In computing diluted net loss per share for the three months ended March 31, 2019 and 2018, no adjustment has been made to the weighted average outstanding common shares as the assumed exercise of outstanding options, warrants and restricted stock units would be anti-dilutive. As of March 31, 2019, there were 25,625,607 outstanding options, 4,329,437 outstanding warrants, and 6,206,257 unvested restricted stock units.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

17.	Commitments and Contingencies

Contingent Consideration

As discussed in Note 3, in September 2015, the Company completed the Senhance Acquisition using a combination of cash, stock and potential post-acquisition milestone payments. These milestone payments may be payable in the future, depending on the achievement of certain regulatory and commercial milestones. On December 30, 2016, the Company entered into an Amendment to restructure the terms of the Second Tranche of the Cash Consideration. Under the Amendment, the Second Tranche was restructured to reduce the contingent cash consideration by €5.0 million in exchange for the issuance of 3,722,685 shares of the Company’s common stock with an aggregate fair market value of €5.0 million. As of March 31, 2019 and December 31, 2018, the fair value of the contingent consideration was $11.6 million and $10.6 million, respectively.

Legal Proceedings

No liability or related charge was recorded to earnings in the Company’s consolidated financial statements for legal contingencies for the three months ended March 31, 2019 or the year ended December 31, 2018.

Subsequent Event

3 Months Ended

Mar. 31, 2019

Subsequent Events [Abstract]

Subsequent Event

18.	Subsequent Event

Effective April 30, 2019, the Hercules Loan Agreement was amended (the “Hercules Amendment”) to eliminate the availability of the Tranche III Loan facility, add a new Tranche IV Loan facility of up to $20 million, revise certain financial covenants and make other changes. The availability of advances under the Tranche IV Loan is not milestone-based, rather the Company can request advances in minimum $5 million increments at any time during the period from July 1, 2019 through December 31, 2020, subject to the funding discretion of the Lender. The monthly trailing six month net revenue financial covenant was amended to be tested quarterly and to change the projected net revenue percentage to be met for the six months ending on the last day of each fiscal quarter. If such quarterly financial covenant is not achieved as of the last day of any fiscal quarter, as tested on the thirtieth day after quarter end, the Company must comply with the waiver conditions in the Hercules Amendment from such test date until the next quarterly test date. The Hercules Amendment was executed by the parties on May 7, 2019.

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Basis of Presentation

Use of Estimates

Cash and Cash Equivalents and Restricted Cash

The Company considers all highly liquid investments with original maturities of 90 days or less at the time of purchase to be cash equivalents.

Short-term Investments

The Company reviews its short-term investments for other-than-temporary impairment if the cost exceeds the fair value. No such impairment was recorded as of March 31, 2019 and December 31, 2018.

Concentrations and Credit Risk

Accounts Receivable

Inventories

Identifiable Intangible Assets and Goodwill

In-Process Research and Development

The IPR&D from MST was acquired on October 31, 2018.

Property and Equipment

Property and equipment consists primarily of machinery, manufacturing equipment, demonstration equipment, computer equipment, furniture, and leasehold improvements, which are recorded at cost.

Depreciation is recorded using the straight-line method over the estimated useful lives of the assets as follows:

Machinery, manufacturing and demonstration equipment		3-5 years
Computer equipment		3 years
Furniture		5 years
Leasehold improvements		Lesser of lease term or 3 to 10 years

Impairment of Long-Lived Assets

Contingent Consideration

Warrant Liabilities

Translation of Foreign Currencies

Business Acquisitions

Risk and Uncertainties

Revenue Recognition

•

The following table presents revenue disaggregated by type and geography:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
	(unaudited)
U.S.
Services	$	133	$	21
Total U.S. revenue		133		21

Outside of U.S. ("OUS")
Systems		1,287		3,454
Instruments and accessories		546		1,111
Services		215		181
Total OUS revenue		2,048		4,746

Total
Systems		1,287		3,454
Instruments and accessories		546		1,111
Services		348		202
Total revenue	$	2,181	$	4,767

The Company recognizes sales by geographic area based on the country in which the customer is based.

Cost of Revenue

Research and Development Costs

Stock-Based Compensation

Income Taxes

Comprehensive (Loss) Income

Comprehensive (loss) income is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources.

Segments

Impact of Recently Issued Accounting Standards

The details of this adjustment are summarized below.


	Balance at		Adjustments Due		Balance at
	December 31, 2018		to ASC 842		January 1, 2019
	(unaudited)
	(In thousands)
Assets
Other long term assets	$	-	$	1,751	$	1,751

Liabilities and Stockholders' Equity
Accrued expenses	$	-	$	507	$	507
Other long term liabilities	$	-	$	1,244	$	1,244

The following table presents the minimum lease payments as of March 31, 2019 (in thousands):

April 1, 2019 to March 31, 2020	$	959
April 1, 2020 to March 31, 2021		518
April 1, 2021 to March 31, 2022		441
April 1, 2022 to March 31, 2023		119
April 1, 2023 to March 31, 2024		18
Total minimum lease payments		2,055
Less: Amount of lease payments representing interest		(218	)
Present value of future minimum lease payments	$	1,837

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Summary of Estimated Lives of Assets

Depreciation is recorded using the straight-line method over the estimated useful lives of the assets as follows:

Machinery, manufacturing and demonstration equipment		3-5 years
Computer equipment		3 years
Furniture		5 years
Leasehold improvements		Lesser of lease term or 3 to 10 years

Summary of Revenue Disaggregated by Type and Geography

The following table presents revenue disaggregated by type and geography:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
	(unaudited)
U.S.
Services	$	133	$	21
Total U.S. revenue		133		21

Outside of U.S. ("OUS")
Systems		1,287		3,454
Instruments and accessories		546		1,111
Services		215		181
Total OUS revenue		2,048		4,746

Total
Systems		1,287		3,454
Instruments and accessories		546		1,111
Services		348		202
Total revenue	$	2,181	$	4,767

Summary of Details of Adjustment

The details of this adjustment are summarized below.


	Balance at		Adjustments Due		Balance at
	December 31, 2018		to ASC 842		January 1, 2019
	(unaudited)
	(In thousands)
Assets
Other long term assets	$	-	$	1,751	$	1,751

Liabilities and Stockholders' Equity
Accrued expenses	$	-	$	507	$	507
Other long term liabilities	$	-	$	1,244	$	1,244

Summary of Minimum Lease Payments

The following table presents the minimum lease payments as of March 31, 2019 (in thousands):

April 1, 2019 to March 31, 2020	$	959
April 1, 2020 to March 31, 2021		518
April 1, 2021 to March 31, 2022		441
April 1, 2022 to March 31, 2023		119
April 1, 2023 to March 31, 2024		18
Total minimum lease payments		2,055
Less: Amount of lease payments representing interest		(218	)
Present value of future minimum lease payments	$	1,837

Acquisitions (Tables) - Medical Surgery Technologies Ltd. [Member]

3 Months Ended

Mar. 31, 2019

Business Acquisition [Line Items]

Summary of Fair Value Consideration

The following table summarizes the acquisition date fair value of the consideration (in thousands).

Stock consideration	$	8,300
Cash consideration		5,800
Present value of deferred consideration		5,900
Other consideration		314
Total consideration	$	20,314

Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed on October 31, 2018, the date of acquisition (in thousands):

Property and equipment	$	43
In-process research and development		10,633
Goodwill		9,638
Net assets acquired	$	20,314

Fair Value (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Measurements Disclosure [Line Items]

Summary of Assets Measured at Fair Value on Recurring Basis

	March 31, 2019
	(In thousands)
	(unaudited)
Description	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets measured at fair value
Cash and cash equivalents	$	25,545	$	—	$	—	$	25,545
Restricted cash		578		—		—		578
Total Assets measured at fair value	$	26,123	$	—	$	—	$	26,123
Liabilities measured at fair value
Contingent consideration	$	—	$	—	$	11,635	$	11,635
Warrant liabilities		—		—	$	4,742	$	4,742
Total liabilities measured at fair value	$	—	$	—	$	16,377	$	16,377

	December 31, 2018
	(In thousands)
Description	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets measured at fair value
Cash and cash equivalents	$	21,061	$	—	$	—	$	21,061
Restricted cash		590		—		—		590
Total Assets measured at fair value	$	21,651	$	—	$	—	$	21,651
Liabilities measured at fair value
Contingent consideration	$	—	$	—	$	10,637	$	10,637
Warrant liabilities		—		—		4,636		4,636
Total liabilities measured at fair value	$	—	$	—	$	15,273	$	15,273

Change in Fair Value for All Assets and Liabilities Using Unobservable Level 3 Inputs As Determined By Level 3 Inputs

The following table summarizes the change in fair value, as determined by Level 3 inputs, for all assets and liabilities using unobservable Level 3 inputs for the three months ended March 31, 2019:

	Fair Value Measurement at Reporting Date (Level 3)
	(In thousands)
	(unaudited)
	Common stock		Contingent
	warrants		consideration
Balance at December 31, 2018	$	4,636	$	10,637
Change in fair value		106		998
Balance at March 31, 2019	$	4,742	$	11,635
Current portion		—		70
Long-term portion		4,742		11,565
Balance at March 31, 2019	$	4,742	$	11,635

Level 3 [Member]

Fair Value Measurements Disclosure [Line Items]

Quantitative Information about Inputs and Valuation Methodologies Used for Fair Value Measurements Classification

Valuation

Methodology

Significant

Unobservable Input

Weighted Average

(range, if

applicable)

Contingent consideration

Probability weighted

income approach

Milestone dates

2019 to 2022

Discount rate

10% to 12%

Series B Warrant [Member]

Fair Value Measurements Disclosure [Line Items]

Quantitative Information about Inputs and Valuation Methodologies Used for Fair Value Measurements Classification

The following table presents the inputs and valuation methodologies used for the Company’s fair value of the Series B Warrants

					April 28, 2017
Series B	March 31, 2019		December 31, 2018		(date of issuance)
Fair value	$4.7 million		$4.6 million		$6.2 million
Valuation methodology	Monte Carlo		Monte Carlo		Black-Scholes Merton
Term	3.08 years		3.32 years		5 years
Risk free rate	2.21%		2.47%		1.81%
Dividends		—		—		—
Volatility	82.37%		87.60%		73.14%
Share price	$	2.38	$	2.26	$	0.65
Probability of additional financing	100% in 2019		100% in 2019		Not Applicable

Accounts Receivable, Net (Tables)

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Summary of Accounts Receivable

The following table presents the components of accounts receivable:

	March 31,			December 31,
	2019			2018
	(In thousands)
	(unaudited)
Gross accounts receivable	$	8,610		$	8,640
Allowance for uncollectible accounts		(79	)		(80	)
Total accounts receivable, net	$	8,531		$	8,560

Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Schedule of Inventory

The components of inventories are as follows:

	March 31,		December 31,
	2019		2018
	(In thousands)
	(unaudited)
Finished goods	$	6,471	$	5,439
Raw materials		8,726		5,502
Total inventories	$	15,197	$	10,941

Other Current Assets (Tables)

3 Months Ended

Mar. 31, 2019

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Schedule of Other Current Assets

The following table presents the components of other current assets:

	March 31,		December 31,
	2019		2018
	(In thousands)
	(unaudited)
Advances to vendors	$	8,578	$	7,758
Prepaid expenses		1,593		1,438
Other receivables		40		9
Total	$	10,211	$	9,205

Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2019

Property Plant And Equipment [Abstract]

Summary of Property and Equipment

Property and equipment consisted of the following:

	March 31,			December 31,
	2019			2018
	(In thousands)
	(unaudited)
Machinery, manufacturing and demonstration equipment	$	12,425		$	12,320
Computer equipment		2,297			2,260
Furniture		635			639
Leasehold improvements		2,272			2,280
Total property and equipment		17,629			17,499
Accumulated depreciation and amortization		(11,706	)		(11,162	)
Property and equipment, net	$	5,923		$	6,337

Goodwill, In-Process Research and Development and Intellectual Property (Tables)

3 Months Ended

Mar. 31, 2019

Schedule of Goodwill and Intangible Assets [Line Items]

Carrying Value of Goodwill and Change in Balance

The carrying value of goodwill and the change in the balance for the three months ended March 31, 2019 is as follows:

	Goodwill
	(In thousands)
	(unaudited)
Balance at December 31, 2018	$	80,131
Foreign currency translation impact		(622	)
Balance at March 31, 2019	$	79,509

Carrying Value of Company's Intangible Assets and Change in Balance

The components of gross intellectual property, accumulated amortization, and net intellectual property as of March 31, 2019 and December 31, 2018 are as follows:

	March 31, 2019									December 31, 2018
	(In thousands)									(In thousands)
	(unaudited)
	Gross Carrying Amount		Accumulated Amortization			Foreign currency translation impact		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Foreign currency translation impact		Net Carrying Amount
Developed technology	$	66,413	$	(33,151	)	$	2,720	$	35,982	$	66,413	$	(30,550	)	$	3,495	$	39,358
Technology and patents purchased		400		(82	)		22	$	340		400		(72	)		30		358
Total intellectual property	$	66,813	$	(33,233	)	$	2,742	$	36,322	$	66,813	$	(30,622	)	$	3,525	$	39,716

In-Process Research and Development [Member]

Schedule of Goodwill and Intangible Assets [Line Items]

Carrying Value of Company's Intangible Assets and Change in Balance

The carrying value of the Company’s IPR&D assets and the change in the balance for the three months ended March 31, 2019 is as follows:

	In-Process Research and Development
	(In thousands)
	(unaudited)
Balance at December 31, 2018	$	10,747
Foreign currency translation impact		(220	)
Balance at March 31, 2019	$	10,527

Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2019

Accrued Liabilities Current [Abstract]

Schedule of Accrued Expenses

The following table presents the components of accrued expenses:

	March 31,		December 31,
	2019		2018
	(In thousands)
	(unaudited)
Compensation and benefits	$	2,125	$	6,225
Consulting and other vendors		1,933		895
Other		646		539
Lease liability		733		—
Royalties		365		498
Legal and professional fees		380		432
Deferred rent		—		391
Taxes and other assessments		602		383
Interest		260		256
Total	$	7,044	$	9,619

Warrants (Tables)

3 Months Ended

Mar. 31, 2019

Text Block [Abstract]

Summary of Change in Warrant

The following table summarizes the change in warrants for the three months ended March 31, 2019:

					Weighted
			Weighted		Average
			Average		Remaining		Weighted
	Number of		Exercise		Contractual		Average
	Warrants		Price		Life (in years)		Fair Value
Outstanding at December 31, 2018		4,329,437	$	1.03		3.7	$	0.26
Exercised		—		—		—		—
Expired		—		—		—		—
Outstanding at March 31, 2019		4,329,437	$	1.03		3.5	$	0.26

Purchase Agreement, Controlled Equity Offering and Public Offering of Common Stock (Tables)

3 Months Ended

Mar. 31, 2019

Purchase Agreement Controlled Equity Offering And Public Offering Of Common Stock [Abstract]

Schedule of Amounts Offered and Sold under 2017 Sales Agreement

The amounts offered and sold under the 2017 Sales Agreement are as set forth below (in thousands, except per share amounts):

	2017 Sales Agreement
	Year Ended December 31, 2017
Total shares of common stock sold		15,998.5
Average price per share	$	3.13
Gross proceeds	$	50,000
Commissions earned by Cantor	$	1,500
Other issuance costs	$	97

Organization and Capitalization - Additional Information (Detail) - USD ($)	1 Months Ended
	Dec. 31, 2017	Mar. 31, 2019	Dec. 31, 2018	Dec. 06, 2013
Organization And Capitalization [Line Items]
Common stock, shares authorized		750,000,000	750,000,000
Preferred stock, shares authorized				25,000,000
Preferred stock, par value (in dollars per share)				$ 0.01
Minimum [Member]
Organization And Capitalization [Line Items]
Common stock, shares authorized				225,000,000
Maximum [Member]
Organization And Capitalization [Line Items]
Common stock, shares authorized				750,000,000
China National Scientific and Instruments and Materials Company [Member]
Organization And Capitalization [Line Items]
Proceeds from distribution agreement	$ 15,000,000
Distribution minimum royalties payment	14,000,000
China National Scientific and Instruments and Materials Company [Member] \| Minimum [Member]
Organization And Capitalization [Line Items]
Expected proceeds from distribution agreement	$ 29,000,000

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) Segment	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019
Accounting Policies [Line Items]
Short-term investments	$ 22,904,000		$ 51,790,000
Impairment charges	$ 0		0
Period of service sale arrangement	5 years
Period of service sale arrangement at stated service price	4 years
Product warranty	1 year
Revenue, remaining performance obligation	$ 3,800,000
Contract assets included in accounts receivable	$ 200,000	$ 100,000
Revenue recognized, included in deferred revenue			300,000	$ 100,000
Statutory income tax rate	21.00%
Decrease in deferred tax assets due to newly enacted tax rate				36,100,000
Decrease in valuation allowance due to newly enacted tax rate				$ 36,100,000
Number of business segments \| Segment	1
Assets	$ 216,976,000		$ 239,307,000
Effect of change in accounting principle		11,000
Weighted average discount rate	8.00%
Right-of-use asset	$ 1,500,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherNoncurrentAssetsMember
Lease liability	$ 1,837,000
Lease liability current	$ 733,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesMember
Lease liability noncurrent	$ 1,100,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherNoncurrentLiabilitiesMember
Weighted average remaining lease term for operating leases	2 years 6 months 7 days
Cash paid for operating leases	$ 400,000
Operating Expenses [Member]
Accounting Policies [Line Items]
Operating lease cost	300,000
Accumulated Deficit [Member]
Accounting Policies [Line Items]
Effect of change in accounting principle	7,000	11,000
Accumulated Deficit [Member] \| ASU 2018-07 [Member]
Accounting Policies [Line Items]
Effect of change in accounting principle	$ 7,000
U.S. [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets	47.00%		54.00%
International [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets, excluding goodwill	40.00%		34.00%
Senhance Surgical Robotic System Acquisition [Member] \| Europe [Member]
Accounting Policies [Line Items]
Assets	$ 115,500,000		$ 111,000,000
Stock Options [Member]
Accounting Policies [Line Items]
Share based compensation, expense recognized	$ 3,000,000	$ 1,800,000
Patents [Member]
Accounting Policies [Line Items]
Amortization period	10 years
Minimum [Member]
Accounting Policies [Line Items]
Amortization period	5 years
Incremental borrowing rate					7.00%
Minimum [Member] \| Developed Technology [Member]
Accounting Policies [Line Items]
Amortization period	5 years
Maximum [Member]
Accounting Policies [Line Items]
Amortization period	10 years
Incremental borrowing rate					8.50%
Maximum [Member] \| Developed Technology [Member]
Accounting Policies [Line Items]
Amortization period	7 years
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Five Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage	90.00%		89.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Five Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage	81.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Two Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage		91.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| U.S. [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage	6.00%	0.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| Europe [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage	35.00%	100.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| Asia [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage	59.00%	0.00%
U.S. Government Securities [Member]
Accounting Policies [Line Items]
Short-term investments	$ 22,900,000		$ 51,800,000
Short-term investments, other-than-temporary impairment	0		0
Held In Cash Collateral Accounts [Member]
Accounting Policies [Line Items]
Restricted cash	$ 600,000		$ 600,000

Summary of Significant Accounting Policies - Summary of Estimated Lives of Assets (Detail)	3 Months Ended
	Mar. 31, 2019
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	5 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	Lesser of lease term or 3 to 10 years
Minimum [Member] \| Machinery, Manufacturing Equipment and Demonstration Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Minimum [Member] \| Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Maximum [Member] \| Machinery, Manufacturing Equipment and Demonstration Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	5 years
Maximum [Member] \| Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	10 years

Summary of Significant Accounting Policies - Summary of Revenue Disaggregated by Type and Geography (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Total revenue	$ 2,181	$ 4,767
Systems [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,287	3,454
Instruments and Accessories [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	546	1,111
Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	348	202
U.S. [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	133	21
U.S. [Member] \| Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	133	21
Outside of U.S. [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	2,048	4,746
Outside of U.S. [Member] \| Systems [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,287	3,454
Outside of U.S. [Member] \| Instruments and Accessories [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	546	1,111
Outside of U.S. [Member] \| Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 215	$ 181

Summary of Significant Accounting Policies - Summary of Details of Adjustment (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Assets
Other long term assets	$ 1,695		$ 203
Liabilities and Stockholders’ Equity
Accrued expenses	7,044		$ 9,619
Other long term liabilities	$ 1,104
ASC 842 [Member]
Assets
Other long term assets		$ 1,751
Liabilities and Stockholders’ Equity
Accrued expenses		507
Other long term liabilities		1,244
ASC 842 [Member] \| Restatement Adjustment [Member]
Assets
Other long term assets		1,751
Liabilities and Stockholders’ Equity
Accrued expenses		507
Other long term liabilities		$ 1,244

Summary of Significant Accounting Policies - Summary of Minimum Lease Payments (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Accounting Policies [Abstract]
April 1, 2019 to March 31, 2020	$ 959
April 1, 2020 to March 31, 2021	518
April 1, 2021 to March 31, 2022	441
April 1, 2022 to March 31, 2023	119
April 1, 2023 to March 31, 2024	18
Total minimum lease payments	2,055
Less: Amount of lease payments representing interest	(218)
Present value of future minimum lease payments	$ 1,837

Acquisitions - Additional Information (Detail)						1 Months Ended	3 Months Ended		12 Months Ended
Acquisitions - Additional Information (Detail)	Mar. 31, 2019 EUR (€)	Oct. 31, 2018 USD ($) shares	Dec. 30, 2016 shares	Sep. 21, 2015 USD ($) shares	Sep. 21, 2015 EUR (€) shares	Jan. 31, 2017 EUR (€)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2019 EUR (€)
Business Acquisition [Line Items]
Additional consideration payable in cash, stock or cash and stock							$ 11,635,000		$ 10,637,000
Revenue							2,181,000	$ 4,767,000
Net loss							(22,525,000)	$ (882,000)
Medical Surgery Technologies Ltd. [Member]
Business Acquisition [Line Items]
Cash consideration		$ 5,800,000
Acquisition agreement, description		The Lock-Up Agreement further provides that the Seller may sell, transfer or convey: (i) no more than 50% of the Securities Consideration during the period commencing on the six-month anniversary of the Closing Date and ending on the twelve-month anniversary of the Closing Date; and (ii) no more than 75% of the Securities Consideration during the period commencing on the twelve-month anniversary of the Closing Date and ending on the eighteen-month anniversary of the Closing Date. The restrictions on transfer contained in the Lock-Up Agreement cease to apply to the Securities Consideration following the eighteen-month anniversary of the closing date of the MST Acquisition, or earlier upon certain other conditions.
In-process research and development		$ 10,633,000
Revenue							0
Net loss							600,000
Medical Surgery Technologies Ltd. [Member] \| Ending on Twelve Month Anniversary [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Percentage of securities consideration		50.00%
Medical Surgery Technologies Ltd. [Member] \| Ending on Eighteen Month Anniversary [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Percentage of securities consideration		75.00%
Medical Surgery Technologies Ltd. [Member] \| First Tranche [Member]
Business Acquisition [Line Items]
Cash consideration		$ 5,800,000
Common shares issued \| shares		3,150,000
Medical Surgery Technologies Ltd. [Member] \| Second Tranche [Member]
Business Acquisition [Line Items]
Additional consideration payable in cash, stock or cash and stock		$ 6,600,000
Senhance Surgical Robotic System Acquisition [Member]
Business Acquisition [Line Items]
Common shares issued \| shares				15,543,413	15,543,413
Additional consideration payable in cash, stock or cash and stock							11,600,000		$ 10,600,000
Senhance Surgical Robotic System Acquisition [Member] \| U.S. Dollars [Member]
Business Acquisition [Line Items]
Cash consideration				$ 25,000,000
Senhance Surgical Robotic System Acquisition [Member] \| Euro [Member]
Business Acquisition [Line Items]
Cash consideration \| €					€ 27,500,000
Senhance Surgical Robotic System Acquisition [Member] \| Second Tranche [Member]
Business Acquisition [Line Items]
Cash consideration \| €	€ 15,100,000
Common shares issued \| shares			3,722,685
Aggregate fair market value \| €						€ 5,000,000
Senhance Surgical Robotic System Acquisition [Member] \| Second Tranche [Member] \| U.S. Dollars [Member]
Business Acquisition [Line Items]
Cash consideration payable							$ 25,000,000
Senhance Surgical Robotic System Acquisition [Member] \| Second Tranche [Member] \| Euro [Member]
Business Acquisition [Line Items]
Cash consideration payable \| €										€ 22,500,000
Senhance Surgical Robotic System Acquisition [Member] \| Third Tranche [Member]
Business Acquisition [Line Items]
Cash consideration payable \| €										15,000,000
Senhance Surgical Robotic System Acquisition [Member] \| Third Tranche [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Target revenue to be achieved \| €										€ 25,000,000

Acquisitions - Summary of Fair Value Consideration (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Oct. 31, 2018	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Contingent consideration		$ 11,635	$ 10,637
Medical Surgery Technologies Ltd. [Member]
Business Acquisition [Line Items]
Stock consideration	$ 8,300
Cash consideration	5,800
Present value of deferred consideration	5,900
Other consideration	314
Total consideration	$ 20,314

Acquisitions - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Oct. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 79,509	$ 80,131
Medical Surgery Technologies Ltd. [Member]
Business Acquisition [Line Items]
Property and equipment			$ 43
In-process research and development			10,633
Goodwill	$ 9,600		9,638
Net assets acquired			$ 20,314

Cash, Cash Equivalents, and Restricted Cash - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash	$ 578	$ 590
Held In Cash Collateral Accounts [Member]
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash	$ 600	$ 600

Fair Value - Additional Information (Detail)		3 Months Ended		12 Months Ended
Fair Value - Additional Information (Detail)	Apr. 28, 2017 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) $ / shares
Fair Value Measurements Disclosure [Line Items]
Transfers of assets between Level 1, Level 2, and Level 3 of the fair value hierarchy		$ 0		$ 0
Transfers of liabilities between Level 1, Level 2, and Level 3 of the fair value hierarchy		0		0
Warrants to purchase common shares \| shares	24,900,000
Offering price \| $ / shares	$ 1.00
Change in fair value of warrant liabilities		106,000	$ (1,829,000)
Series A Warrant [Member]
Fair Value Measurements Disclosure [Line Items]
Warrants, exercise price \| $ / shares	$ 1.00
Warrant expiration date	Oct. 31, 2017
Series A Warrant [Member] \| Black-Scholes Merton Model [Member]
Fair Value Measurements Disclosure [Line Items]
Estimated fair value of warrants	$ 2,500,000
Fair value input, share price \| $ / shares	$ 0.65
Series A Warrant [Member] \| Black-Scholes Merton Model [Member] \| Measurement Input, Expected Term [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, term	1 year
Series A Warrant [Member] \| Black-Scholes Merton Model [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, risk free rate	0.0107
Series A Warrant [Member] \| Black-Scholes Merton Model [Member] \| Measurement Input, Expected Dividend Payment [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, risk free rate	0
Series A Warrant [Member] \| Black-Scholes Merton Model [Member] \| Measurement Input, Price Volatility [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, risk free rate	0.7314
Series B Warrant [Member]
Fair Value Measurements Disclosure [Line Items]
Warrants, exercise price \| $ / shares	$ 1.00
Estimated fair value of warrants	$ 6,200,000	$ 4,700,000		$ 4,600,000
Fair value input, share price \| $ / shares	$ 0.65	$ 2.38		$ 2.26
Change in fair value of warrant liabilities		$ 100,000		$ (1,800,000)
Series B Warrant [Member] \| Measurement Input, Expected Term [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, term	5 years	3 years 29 days		3 years 3 months 25 days
Series B Warrant [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, risk free rate	1.81	2.21		2.47
Series B Warrant [Member] \| Measurement Input, Price Volatility [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, risk free rate	73.14	82.37		87.60
Common Stock [Member]
Fair Value Measurements Disclosure [Line Items]
Number of common stock or warrants in each unit \| shares	1
Common Stock [Member] \| Series A Warrant [Member]
Fair Value Measurements Disclosure [Line Items]
Number of common stock or warrants in each unit \| shares	1
Common Stock [Member] \| Series B Warrant [Member]
Fair Value Measurements Disclosure [Line Items]
Number of common stock or warrants in each unit \| shares	0.75
Senhance Surgical Robotic System Acquisition [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value of contingent consideration		$ 1,000,000	$ 600,000

Fair Value - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Assets measured at fair value
Cash and cash equivalents	$ 25,545	$ 21,061
Restricted cash	578	590
Total Assets measured at fair value	26,123	21,651
Liabilities measured at fair value
Contingent consideration	11,635	10,637
Warrant liabilities	4,742	4,636
Total liabilities measured at fair value	16,377	15,273
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets measured at fair value
Cash and cash equivalents	25,545	21,061
Restricted cash	578	590
Total Assets measured at fair value	26,123	21,651
Significant Unobservable Inputs (Level 3) [Member]
Liabilities measured at fair value
Contingent consideration	11,635	10,637
Warrant liabilities	4,742	4,636
Total liabilities measured at fair value	$ 16,377	$ 15,273

Fair Value - Quantitative Information about Inputs and Valuation Methodologies Used for Fair Value Measurements Classification (Detail) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Apr. 28, 2017 USD ($) $ / shares
Senhance Surgical Robotic System Acquisition [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Contingent Consideration [Member] \| Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Milestone dates	2019
Senhance Surgical Robotic System Acquisition [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Contingent Consideration [Member] \| Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Milestone dates	2022
Measurement Input, Discount Rate [Member] \| Senhance Surgical Robotic System Acquisition [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Contingent Consideration [Member] \| Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rate	0.10
Measurement Input, Discount Rate [Member] \| Senhance Surgical Robotic System Acquisition [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Contingent Consideration [Member] \| Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rate	0.12
Series B Warrant [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value \| $	$ 4.7	$ 4.6	$ 6.2
Valuation methodology	trxc:MonteCarloMember	trxc:MonteCarloMember	trxc:BlackScholesMertonMember
Share price \| $ / shares	$ 2.38	$ 2.26	$ 0.65
Probability of additional financing in 2019	100.00%	100.00%
Series B Warrant [Member] \| Measurement Input, Expected Term [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Term	3 years 29 days	3 years 3 months 25 days	5 years
Series B Warrant [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Risk free rate	2.21	2.47	1.81
Series B Warrant [Member] \| Measurement Input, Price Volatility [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Risk free rate	82.37	87.60	73.14

Fair Value - Change in Fair Value for All Assets and Liabilities Using Unobservable Level 3 Inputs As Determined By Level 3 Inputs (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Common Stock Warrants [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 4,636
Change in fair value	106
Long-term portion	4,742
Ending balance	4,742
Contingent Consideration [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	10,637
Change in fair value	998
Current portion	70
Long-term portion	11,565
Ending balance	$ 11,635

Accounts Receivable, Net - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Gross accounts receivable	$ 8,610	$ 8,640
Allowance for uncollectible accounts	(79)	(80)
Total accounts receivable, net	$ 8,531	$ 8,560

Inventories - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Finished goods	$ 6,471	$ 5,439
Raw materials	8,726	5,502
Total inventories	$ 15,197	$ 10,941

Other Current Assets - Schedule of Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Advances to vendors	$ 8,578	$ 7,758
Prepaid expenses	1,593	1,438
Other receivables	40	9
Total	$ 10,211	$ 9,205

Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 17,629	$ 17,499
Accumulated depreciation and amortization	(11,706)	(11,162)
Property and equipment, net	5,923	6,337
Machinery, Manufacturing and Demonstration Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	12,425	12,320
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	2,297	2,260
Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	635	639
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 2,272	$ 2,280

Property and Equipment - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Property Plant And Equipment [Abstract]
Depreciation	$ 0.6	$ 0.7

Goodwill, In-Process Research and Development and Intellectual Property - Additional Information (Detail) - USD ($)			3 Months Ended		12 Months Ended
	Oct. 31, 2018	Sep. 21, 2015	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Goodwill And Intangible Assets [Line Items]
Goodwill			$ 79,509,000	$ 80,131,000	$ 80,131,000
Accumulated impairment of goodwill			61,800,000	61,800,000	61,800,000
Goodwill impairment			$ 0	$ 0	$ 0
In-Process Research and Development [Member]
Goodwill And Intangible Assets [Line Items]
Discount rate	15.00%	45.00%
Intellectual Property [Member]
Goodwill And Intangible Assets [Line Items]
Discount rate		45.00%
Technology and Patents Purchased [Member]
Goodwill And Intangible Assets [Line Items]
Weighted average remaining useful life			8 years 1 month 6 days		8 years 3 months 18 days
Developed Technology [Member]
Goodwill And Intangible Assets [Line Items]
Weighted average remaining useful life			3 years 6 months		3 years 9 months 18 days
Safe Stitch Medical Inc [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill			$ 93,800,000
Senhance Surgical Robotic System Acquisition [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill			38,300,000
Intellectual property		$ 48,500,000
Senhance Surgical Robotic System Acquisition [Member] \| In-Process Research and Development [Member]
Goodwill And Intangible Assets [Line Items]
In-process research and development		$ 17,100,000
Senhance Surgical Robotic System Acquisition [Member] \| Technology and Patents Purchased [Member]
Goodwill And Intangible Assets [Line Items]
Acquisition price						$ 400,000
Medical Surgery Technologies Ltd. [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 9,638,000		$ 9,600,000
Acquisition price	20,314,000
Medical Surgery Technologies Ltd. [Member] \| In-Process Research and Development [Member]
Goodwill And Intangible Assets [Line Items]
In-process research and development	$ 10,600

Goodwill, In-Process Research and Development and Intellectual Property - Carrying Value of Goodwill and Change in Balance (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$ 80,131
Foreign currency translation impact	(622)
Ending balance	$ 79,509

Goodwill, In-Process Research and Development and Intellectual Property - Carrying Value of Company's IPR&D Assets and Change in Balance (Detail) - In-Process Research and Development [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items]
Beginning balance	$ 10,747
Foreign currency translation impact	(220)
Ending balance	$ 10,527

Goodwill, In-Process Research and Development and Intellectual Property - Summary of Gross Intellectual Property, Accumulated Amortization, and Net Intellectual Property (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 66,413	$ 66,413
Accumulated Amortization	(33,151)	(30,550)
Foreign currency translation impact	2,720	3,495
Net Carrying Amount	35,982	39,358
Technology and Patents Purchased [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	400	400
Accumulated Amortization	(82)	(72)
Foreign currency translation impact	22	30
Net Carrying Amount	340	358
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	66,813	66,813
Accumulated Amortization	(33,233)	(30,622)
Foreign currency translation impact	2,742	3,525
Net Carrying Amount	$ 36,322	$ 39,716

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Estimates annual effective tax rate	4.60%
Deferred tax benefit	$ 610,000	$ 890,000
Current tax expense	$ (610,000)	$ (890,000)
Effective tax rate	2.60%	50.20%
Unrecognized tax benefits that would affect effective tax rate	$ 0
GILTI deferred amounts				$ 0
GILTI income tax	0		$ 0
Foreign Tax Authority [Member] \| TransEnterix Italia [Member]
Income Tax Contingency [Line Items]
Net deferred tax asset	0
Valuation allowance	0
Foreign Tax Authority [Member] \| Israel Tax Authority [Member]
Income Tax Contingency [Line Items]
Current tax expense	$ 20,000

Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accrued Liabilities Current [Abstract]
Compensation and benefits	$ 2,125	$ 6,225
Consulting and other vendors	1,933	895
Other	646	539
Lease liability	733
Royalties	365	498
Legal and professional fees	380	432
Deferred rent		391
Taxes and other assessments	602	383
Interest	260	256
Total	$ 7,044	$ 9,619

Notes Payable - Additional Information (Detail) - USD ($)			1 Months Ended		3 Months Ended	12 Months Ended
	May 23, 2018	May 10, 2017	May 31, 2018	May 31, 2017	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 09, 2019	Apr. 30, 2019	Oct. 23, 2018	Apr. 28, 2017
Debt Instrument [Line Items]
Issue of warrants to purchase shares of company's common stock												24,900,000
Notes Payable [Member]
Debt Instrument [Line Items]
Debt issuance costs paid to prior lenders and third parties								$ 400,000
Debt issuance cost								300,000
Debt unamortized balance								$ 100,000
Notes Payable [Member] \| Loss on Extinguishment of Notes Payable [Member]
Debt Instrument [Line Items]
Debt unamortized balance				$ 100,000
Hercules Loan Agreement [Member]
Debt Instrument [Line Items]
Debt discount liability, facility fee recorded as debt discount			$ 300,000
Debt Instrument, redemption price amount			$ 700,000
Hercules Loan Agreement [Member] \| Notes Payable [Member] \| Interest Expense [Member]
Debt Instrument [Line Items]
Loss on Extinguishment of notes payable						$ (1,400,000)
Hercules Loan Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Note issuance date	May 23, 2018
Term loans aggregate principal amount	$ 40,000,000
Repayment of term loans period	18 months
Debt instrument amortization schedule	18 months
Debt instrument repayment term					The Company is entitled to make interest-only payments until December 1, 2020, and at the end of the interest-only period, the Company will be required to repay the term loans over an eighteen-month period based on an eighteen-month amortization schedule, with a final maturity date of June 1, 2022.
Interest only payment date	Dec. 01, 2020
Maturity date of the term loans	Jun. 01, 2022
Debt discount liability, facility fee recorded as debt discount	$ 400,000
Debt issuance costs recorded as debt discount	$ 1,100,000
Prepayment fee percentage	6.95%
Term loans payment terms					In addition, the Company is permitted to prepay the term loans in full at any time, with a prepayment fee of 3.0% of the outstanding principal amount of the loan in the first year after the Initial Funding Date, 2.0% if the prepayment occurs in the second year after the Initial Funding Date and 1.0% thereafter. Upon prepayment of the term loans in full or repayment of the terms loans at the maturity date or upon acceleration, the Company is required to pay a final fee of 6.95% of the aggregate principal amount of term loans funded. The final payment fee is accreted to interest expense over the life of the term loan and included within notes payable on the consolidated balance sheet.
Percentage outstanding principal balance of term loans required to be maintained	120.00%
Percentage of maintained cash and investment property in accounts of aggregate cash of parent and subsidiaries	80.00%
Amount of investment to any future equity offering	$ 2,000,000
Hercules Loan Agreement [Member] \| Term Loan [Member] \| Fixed Rate and Prime Rate [Member]
Debt Instrument [Line Items]
Term loans interest rate	5.00%
Hercules Loan Agreement [Member] \| Term Loan [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Term loans fixed interest rate	9.55%
Hercules Loan Agreement [Member] \| Term Loan [Member] \| First Year After Initial Funding Date [Member]
Debt Instrument [Line Items]
Prepayment fee percentage	3.00%
Hercules Loan Agreement [Member] \| Term Loan [Member] \| Second Year After Initial Funding Date [Member]
Debt Instrument [Line Items]
Prepayment fee percentage	2.00%
Hercules Loan Agreement [Member] \| Term Loan [Member] \| Second Year After Initial Funding Date And Thereafter [Member]
Debt Instrument [Line Items]
Prepayment fee percentage	1.00%
Hercules Loan Agreement [Member] \| Term Loan [Member] \| First Tranche [Member]
Debt Instrument [Line Items]
Term loans aggregate principal amount	$ 20,000,000
Hercules Loan Agreement [Member] \| Term Loan [Member] \| Second Tranche [Member]
Debt Instrument [Line Items]
Term loans aggregate principal amount											$ 10,000,000
Hercules Loan Agreement [Member] \| Term Loan [Member] \| Tranche Four [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Term loans aggregate principal amount									$ 20,000,000	$ 20,000,000
Hercules Loan Agreement [Member] \| Term Loan [Member] \| Tranche Three
Debt Instrument [Line Items]
Term loans fixed interest rate	9.20%
Loan and Security Agreement [Member]
Debt Instrument [Line Items]
Debt discount liability, facility fee recorded as debt discount				300,000
Debt Instrument, redemption price amount				$ 1,300,000
Loan and Security Agreement [Member] \| Notes Payable [Member] \| Interest Expense [Member]
Debt Instrument [Line Items]
Loss on Extinguishment of notes payable							$ (300,000)
Loan and Security Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt issuance costs recorded as debt discount		$ 1,200,000
Warrant expiration period		5 years
Loan and Security Agreement [Member] \| Term Loan [Member] \| Innovatus Life Sciences Lending Fund I, LP [Member]
Debt Instrument [Line Items]
Note issuance date		May 10, 2017
Term loans aggregate principal amount		$ 17,000,000
Repayment of term loans period		2 years
Debt instrument amortization schedule		24 months
Maturity date of the term loans	May 10, 2021
Term loans fixed interest rate		11.00%
Term loans fixed interest rate, paid in-kind percentage		2.50%
Interest only payment period		24 months
Loan and Security Agreement [Member] \| Term Loan [Member] \| First Tranche [Member]
Debt Instrument [Line Items]
Debt discount liability, facility fee recorded as debt discount		$ 200,000
Warrants, exercise price		$ 1.00
Estimated fair value of warrants		$ 300,000
Unamortized debt discount						$ 0
Loan and Security Agreement [Member] \| Term Loan [Member] \| First Tranche [Member] \| Innovatus Life Sciences Lending Fund I, LP [Member]
Debt Instrument [Line Items]
Term loans aggregate principal amount		$ 14,000,000
Loan and Security Agreement [Member] \| Term Loan [Member] \| First Tranche [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Issue of warrants to purchase shares of company's common stock		1,244,746

Warrants - Summary of Change in Warrant (Detail) - Warrants Not Settleable in Cash [Member] - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Class Of Warrant Or Right [Line Items]
Number of Warrants, Outstanding, Beginning balance	4,329,437
Number of Warrants, Outstanding, Ending balance	4,329,437	4,329,437
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 1.03
Weighted Average Exercise Price, Outstanding, Ending balance	$ 1.03	$ 1.03
Weighted Average Remaining Contractual Life, Outstanding	3 years 6 months	3 years 8 months 12 days
Weighted Average Fair Value, Outstanding, Beginning balance	$ 0.26
Weighted Average Fair Value, Outstanding, Ending balance	$ 0.26	$ 0.26

Purchase Agreement, Controlled Equity Offering and Public Offering of Common Stock - Additional Information (Detail) - USD ($)				3 Months Ended
	Dec. 28, 2018	Aug. 31, 2017	Apr. 28, 2017	Mar. 31, 2019
Stockholders Equity Common Stock [Line Items]
Warrants to purchase common shares			24,900,000
Offering price			$ 1.00
Gross proceeds from public offering			$ 24,900,000
Net proceeds from public offering			$ 23,200,000
Warrants exercised			0
Stifel, Nicolaus & Company, Incorporated [Member]
Stockholders Equity Common Stock [Line Items]
Percentage of commission paid	3.00%	3.00%
Total shares of common stock sold				0
Stifel, Nicolaus & Company, Incorporated [Member] \| Maximum [Member]
Stockholders Equity Common Stock [Line Items]
Sale of common stock in an at-the-market offering	$ 75,000,000	$ 50,000,000
Common Stock [Member]
Stockholders Equity Common Stock [Line Items]
Number of common stock or warrants in each unit			1
Common Stock [Member] \| Series A Warrant [Member]
Stockholders Equity Common Stock [Line Items]
Number of common stock or warrants in each unit			1
Common Stock [Member] \| Series B Warrant [Member]
Stockholders Equity Common Stock [Line Items]
Number of common stock or warrants in each unit			0.75

Purchase Agreement, Controlled Equity Offering and Public Offering of Common Stock - Schedule of Amounts Offered and Sold under 2017 Sales Agreement (Detail) - Stifel, Nicolaus & Company, Incorporated [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2017
Sale And Issue Of Shares Under Agreement [Line Items]
Total shares of common stock sold	0
2017 Sales Agreement [Member]
Sale And Issue Of Shares Under Agreement [Line Items]
Total shares of common stock sold		15,998,500
Average price per share		$ 3.13
Gross proceeds		$ 50,000
Commissions earned by Cantor		1,500
Other issuance costs		$ 97

Basic and Diluted Net Loss per Share - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Adjustment to weighted average outstanding common shares	0	0
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	25,625,607
Stock Warrants [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	4,329,437
Unvested Restricted Stock Units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	6,206,257

Commitments and Contingencies - Additional Information (Detail) € in Millions			3 Months Ended		12 Months Ended
	Dec. 30, 2016 EUR (€) shares	Sep. 21, 2015 shares	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Fair value of contingent consideration			$ 11,635,000		$ 10,637,000
Liability or related charge recorded for legal contingencies			0		0
Senhance Surgical Robotic System Acquisition [Member]
Operating Leased Assets [Line Items]
Contingent consideration related to acquisition			1,000,000	$ 600,000
Common shares issued \| shares		15,543,413
Fair value of contingent consideration			$ 11,600,000		$ 10,600,000
Senhance Surgical Robotic System Acquisition [Member] \| Second Tranche [Member]
Operating Leased Assets [Line Items]
Contingent consideration related to acquisition \| €	€ (5.0)
Common shares issued \| shares	3,722,685
Aggregate fair market value of common stock \| €	€ 5.0

Subsequent Event - Additional Information (Detail) - Hercules Loan Agreement [Member] - Term Loan [Member] - USD ($)		3 Months Ended
	Apr. 30, 2019	Mar. 31, 2019	May 09, 2019	May 23, 2018
Subsequent Event [Line Items]
Term loans aggregate principal amount				$ 40,000,000
Tranche Four [Member]
Subsequent Event [Line Items]
Loan facility covenant terms		The monthly trailing six month net revenue financial covenant was amended to be tested quarterly and to change the projected net revenue percentage to be met for the six months ending on the last day of each fiscal quarter.
Loan facility covenant compliance		If such quarterly financial covenant is not achieved as of the last day of any fiscal quarter, as tested on the thirtieth day after quarter end, the Company must comply with the waiver conditions in the Hercules Amendment from such test date until the next quarterly test date.
Tranche Four [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Term loans aggregate principal amount	$ 20,000,000		$ 20,000,000
Minimum advances available under facility	$ 5,000,000
Loan agreement amendment execution date	May 07, 2019