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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Aggregate number of common shares reserved for future issuance.

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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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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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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)	9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) Segment	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	May 25, 2017 shares
Accounting Policies [Line Items]
Restricted cash	$ 6,386,000		$ 10,425,000
Period of free service sale arrangement	1 year
Common stock, capital shares authorized for issuance \| shares				25,940,000
Number of business segments \| Segment	1
Assets	$ 183,724,000		$ 176,249,000
U.S. [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets	57.00%
International [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets, excluding goodwill	43.00%		40.00%
Senhance Surgical Robotic System Acquisition [Member] \| Europe [Member]
Accounting Policies [Line Items]
Assets	$ 79,000,000
Stock Options [Member]
Accounting Policies [Line Items]
Share based compensation, expense recognized	$ 5,321,000	$ 3,858,000
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 Six [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage	100.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer Three [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage			100.00%
Held In Cash Money Market Account [Member]
Accounting Policies [Line Items]
Restricted cash	$ 6,000,000
Held In Cash Collateral Accounts [Member]
Accounting Policies [Line Items]
Restricted cash	$ 386,000