Accounting Policies [Line Items]

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Percentage of assets by geographic regions excluding goodwill.

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Percentage of company assets.

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Period of free service sale arrangement.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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No definition available.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Summary of Significant Accounting Policies - Additional Information (Detail)			3 Months Ended								12 Months Ended
	Sep. 21, 2015	Mar. 31, 2014 $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) $ / shares shares	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) Segment $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($)	Mar. 30, 2014 shares
Accounting Policies [Line Items]
Accumulated deficit			$ (302,844,000)				$ (182,864,000)				$ (302,844,000)	$ (182,864,000)
Net loss			$ (13,992,000)	$ (12,944,000)	$ (80,131,000)	$ (12,913,000)	$ (13,579,000)	$ (13,901,000)	$ (9,348,000)	$ (10,120,000)	$ (119,980,000)	$ (46,948,000)	$ (37,652,000)
Reverse stock split, ratio		0.2									0.2
Common stock, shares issued \| shares		48,855,255	115,781,030				100,180,872				115,781,030	100,180,872		244,276,923
Common stock, shares outstanding \| shares		48,855,255	115,687,351				100,149,453				115,687,351	100,149,453		244,276,923
Common stock, par value (in dollars per share) \| $ / shares		$ 0.001	$ 0.001				$ 0.001				$ 0.001	$ 0.001
Restricted cash			$ 10,425,000								$ 10,425,000
Investments			0				$ 0				0	$ 0	0
Revenue			53,000	$ 1,466,000							$ 1,519,000		401,000
Impairment charges												0	0
Period of free service sale arrangement											1 year
Number of business segments \| Segment											1
Goodwill			$ 176,249,000				$ 248,602,000				$ 176,249,000	248,602,000
ASU 2016-18 [Member] \| New Accounting Pronouncement, Early Adoption, Effect [Member]
Accounting Policies [Line Items]
Restricted cash												$ 250,000	125,000
U.S. [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets			49.00%								49.00%
International [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets, excluding goodwill			40.00%				28.00%				40.00%	28.00%
Senhance Surgical Robotic System Acquisition [Member]
Accounting Policies [Line Items]
Amortization period	7 years
Senhance Surgical Robotic System Acquisition [Member] \| Europe [Member]
Accounting Policies [Line Items]
Goodwill			$ 90,400,000								$ 90,400,000
Stock Options [Member]
Accounting Policies [Line Items]
Share based compensation, expense recognized											$ 5,033,000	$ 3,311,000	$ 1,840,000
Minimum [Member]
Accounting Policies [Line Items]
Amortization period											7 years
Maximum [Member]
Accounting Policies [Line Items]
Amortization period											10 years
Sales [Member]
Accounting Policies [Line Items]
Revenue												$ 0
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer One [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage											100.00%	100.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Customer One [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage											100.00%		10.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Customer Two [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage													37.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| U.S. [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage											0.00%	0.00%	90.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| Europe [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage											100.00%	0.00%	0.00%
Held In Cash Money Market Account [Member]
Accounting Policies [Line Items]
Restricted cash			10,000,000								$ 10,000,000
Held In Cash Collateral Accounts [Member]
Accounting Policies [Line Items]
Restricted cash			$ 425,000								$ 425,000