Accounting policies.

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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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Percentage of company assets.

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Period of service sale arrangement.

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Period of service sale arrangement at stated service price.

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Product warranty period.

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

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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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Tax cuts and jobs act of 2017 measurement period.

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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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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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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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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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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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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) Segment
Accounting Policies [Line Items]
Impairment charges	$ 0		$ 0
Deferred gain on sale of SurgiBot assets			7,500,000
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	$ 3,700,000
Contract assets included in accounts receivable	100,000	$ 0
Revenue recognized, included in deferred revenue	$ 100,000	0
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
Tax cuts and jobs act of 2017, measurement period	1 year
Number of business segments \| Segment			1
Assets	$ 246,175,000		$ 250,251,000
Cumulative catch-up adjustment to retained earnings	11,000
Reductions in accounts receivable	(296,000)	(753,000)
ASU 2014-09 [Member]
Accounting Policies [Line Items]
Cumulative catch-up adjustment to retained earnings	11,000
Reductions in accounts receivable	4,000
Deferred revenue	15,000
ASU 2014-09 [Member] \| Prior Standard, Revenue [Member]
Accounting Policies [Line Items]
Deferred revenue	$ 8,000
U.S. [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets	60.00%		60.00%
Europe [Member]
Accounting Policies [Line Items]
Assets	$ 99,200,000		$ 99,900,000
International [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets, excluding goodwill	31.00%		31.00%
Stock Options [Member]
Accounting Policies [Line Items]
Share based compensation, expense recognized	$ 1,834,000	$ 2,139,000
Patents [Member]
Accounting Policies [Line Items]
Amortization period	10 years
Minimum [Member]
Accounting Policies [Line Items]
Amortization period	5 years
Minimum [Member] \| Developed Technology [Member]
Accounting Policies [Line Items]
Amortization period	5 years
Maximum [Member]
Accounting Policies [Line Items]
Amortization period	10 years
Maximum [Member] \| Developed Technology [Member]
Accounting Policies [Line Items]
Amortization period	7 years
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| One Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage	74.00%		88.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Two Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage	91.00%	91.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| Europe [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage	100.00%	100.00%
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	$ 779,000		$ 389,000