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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Segment $ / shares	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) $ / shares	May 24, 2018 $ / shares shares
Accounting Policies [Line Items]
Impairment charges				$ 0		$ 0
Deferred gain from 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	$ 3,600,000			$ 3,600,000
Contract assets included in accounts receivable	$ 100,000		$ 0	100,000	$ 0
Revenue recognized, included in deferred revenue				$ 200,000	200,000
Common stock, capital shares authorized for issuance \| shares							40,940,000
Common stock, par value \| $ / shares	$ 0.001			$ 0.001		$ 0.001	$ 0.001
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	$ 242,747,000			$ 242,747,000		250,251,000
Cumulative catch-up adjustment to retained earnings				11,000
Reductions in accounts receivable				(762,000)	(487,000)
Cash and cash equivalents used in operating activities				(19,190,000)	(25,515,000)	47,300,000
Cash and cash equivalents provided by investing activities				$ 4,170,000	(1,795,000)	5,500,000
Restatement Adjustment [Member]
Accounting Policies [Line Items]
Cash and cash equivalents used in operating activities						(7,500,000)
Cash and cash equivalents provided by investing activities						$ 7,500,000
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	61.00%			61.00%		60.00%
Europe [Member]
Accounting Policies [Line Items]
Assets	$ 93,700,000			$ 93,700,000		$ 99,900,000
International [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets, excluding goodwill	30.00%			30.00%		31.00%
Stock Options [Member]
Accounting Policies [Line Items]
Share based compensation, expense recognized				$ 4,204,000	$ 3,679,000
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				78.00%		88.00%
Customer Concentration Risk [Member] \| Sales [Member] \| One Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage			88.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Five Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage				94.00%	91.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Three Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage	96.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| U.S. [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage				12.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| Europe [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage				87.00%	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	$ 750,000			$ 750,000		$ 389,000