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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Segment $ / shares	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) $ / shares	May 24, 2018 $ / shares shares
Accounting Policies [Line Items]
Short-term investments	$ 39,670,000			$ 39,670,000
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	4,400,000			$ 4,400,000
Contract assets included in accounts receivable	$ 100,000		$ 0	100,000	$ 0
Revenue recognized, included in deferred revenue				$ 300,000	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	$ 227,559,000			$ 227,559,000		250,251,000
Cumulative catch-up adjustment to retained earnings				11,000
Reductions in accounts receivable				(4,262,000)	886,000
Cash and cash equivalents used in operating activities				(35,641,000)	(37,549,000)	47,300,000
Cash and cash equivalents provided by investing activities				(35,581,000)	(1,906,000)	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	$ 15,000			$ 15,000
U.S. [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets	60.00%			60.00%		60.00%
Europe [Member]
Accounting Policies [Line Items]
Assets	$ 91,800,000			$ 91,800,000		$ 99,900,000
International [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets, excluding goodwill	31.00%			31.00%		31.00%
Stock Options [Member]
Accounting Policies [Line Items]
Share based compensation, expense recognized				$ 6,694,000	$ 5,321,000
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] \| Four Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage				88.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| One Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage						88.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Four Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage	96.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Five Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage			100.00%	68.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Two Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage					89.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| U.S. [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage				16.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| Europe [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage				83.00%	62.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| Asia [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage					38.00%
U.S. Government Securities [Member]
Accounting Policies [Line Items]
Short-term investments	$ 39,700,000			$ 39,700,000		$ 0
Short-term investments, other-than-temporary impairment				0
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	$ 663,000			$ 663,000		$ 389,000