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Deferred gain on sale of property current.

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Percentage of assets by geographic regions excluding goodwill.

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Period of free service sale arrangement.

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Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, decrease in valuation allowance, income tax expense.

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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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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended						12 Months Ended
	Sep. 21, 2015	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2018	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Accounting Policies [Line Items]
Revenue		$ 3,398,000	$ 183,000	$ 1,584,000	$ 1,946,000	$ 53,000	$ 1,466,000		$ 7,111,000	$ 1,519,000
Impairment charges									0		$ 0
Deferred gain on sale of SurgiBot assets		7,500,000							$ 7,500,000
Period of free service sale arrangement									1 year
Statutory income tax rate									34.00%	34.00%	34.00%
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		$ 250,251,000				$ 176,249,000			$ 250,251,000	$ 176,249,000
U.S. [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets		60.00%				49.00%			60.00%	49.00%
International [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets, excluding goodwill		31.00%				40.00%			31.00%	40.00%
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]
Assets		$ 99,900,000				$ 90,400,000			$ 99,900,000	$ 90,400,000
Scenario, Plan [Member]
Accounting Policies [Line Items]
Statutory income tax rate								21.00%
Stock Options [Member]
Accounting Policies [Line Items]
Share based compensation, expense recognized									$ 7,078,000	$ 5,033,000	$ 3,311,000
Patents [Member]
Accounting Policies [Line Items]
Amortization period									10 years
Minimum [Member]
Accounting Policies [Line Items]
Amortization period									5 years
Minimum [Member] \| Developed Research and Development [Member]
Accounting Policies [Line Items]
Amortization period									5 years
Maximum [Member]
Accounting Policies [Line Items]
Amortization period									10 years
Maximum [Member] \| Developed Research and Development [Member]
Accounting Policies [Line Items]
Amortization period									7 years
Sales [Member]
Accounting Policies [Line Items]
Revenue											$ 0
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Eight Customers [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage									100.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| One Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage										100.00%	100.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Eight Customers [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage									100.00%
Customer Concentration Risk [Member] \| Sales [Member] \| One Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage										100.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| U.S. [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage									18.00%	0.00%	0.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| Europe [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage									61.00%	100.00%	0.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| Asia [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage									21.00%	0.00%	0.00%
Held In Cash Money Market Account [Member]
Accounting Policies [Line Items]
Restricted cash		6,000,000							$ 6,000,000
Held In Cash Collateral Accounts [Member]
Accounting Policies [Line Items]
Restricted cash		$ 389,000							$ 389,000