Accounting policies.

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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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- 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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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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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) Segment	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Accounting Policies [Line Items]
Accumulated deficit	$ (318,258,000)		$ (302,844,000)
Restricted cash	10,432,000		10,425,000
Impairment charges	$ 0		0
Period of free service sale arrangement	1 year
Number of business segments \| Segment	1
Goodwill	$ 166,352,000		$ 176,249,000
U.S. [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets	44.00%
International [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets, excluding goodwill	44.00%		40.00%
Senhance Surgical Robotic System Acquisition [Member] \| Europe [Member]
Accounting Policies [Line Items]
Goodwill	$ 92,600,000
Stock Options [Member]
Accounting Policies [Line Items]
Share based compensation, expense recognized	$ 2,139,000	$ 1,428,000
Minimum [Member]
Accounting Policies [Line Items]
Amortization period	7 years
Maximum [Member]
Accounting Policies [Line Items]
Amortization period	10 years
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer Three [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage	100.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer One [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage			100.00%
Held In Cash Money Market Account [Member]
Accounting Policies [Line Items]
Restricted cash	$ 10,000,000
Held In Cash Collateral Accounts [Member]
Accounting Policies [Line Items]
Restricted cash	$ 432,000