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Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended			12 Months Ended
	Sep. 21, 2015	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Accounting Policies [Line Items]
Short-term investments					$ 51,790,000
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					$ 5,600,000
Contract assets included in accounts receivable					200,000	100,000
Revenue recognized, included in deferred revenue					400,000	$ 300,000
Reversal of transfer fee accrual		$ 2,994,000			$ 2,994,000
Statutory income tax rate					21.00%	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					$ 239,307,000	250,251,000
Cumulative catch-up adjustment to retained earnings					11,000
Reductions in accounts receivable					(7,225,000)	(381,000)	$ (1,041,000)
Cash and cash equivalents used in operating activities					48,493,000	47,295,000	52,386,000
Cash and cash equivalents provided by investing activities					(53,481,000)	5,509,000	(1,361,000)
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					$ (128,000)
U.S. [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets					54.00%	60.00%
International [Member]
Accounting Policies [Line Items]
Percentage of total consolidated assets, excluding goodwill					34.00%	31.00%
Stock Options [Member]
Accounting Policies [Line Items]
Share based compensation, expense recognized					$ 9,039,000	$ 7,078,000	$ 5,033,000
Senhance Surgical Robotic System Acquisition [Member]
Accounting Policies [Line Items]
Amortization period	7 years
Transfer fee accrual term				3 years
Reversal of transfer fee accrual				$ 3,000,000
Senhance Surgical Robotic System Acquisition [Member] \| Europe [Member]
Accounting Policies [Line Items]
Assets					$ 111,000,000	$ 99,900,000
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] \| Five Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage					89.00%
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] \| One Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage							100.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Four Customer [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage						93.00%
Customer Concentration Risk [Member] \| Sales [Member] \| Twelve 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%	18.00%	0.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| Europe [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage					78.00%	61.00%	100.00%
Geographic Concentration Risk [Member] \| Sales [Member] \| Asia [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage					6.00%	21.00%	0.00%
U.S. Government Securities [Member]
Accounting Policies [Line Items]
Short-term investments					$ 51,800,000	$ 0
Short-term investments, other-than-temporary impairment					0
Held In Cash Collateral Accounts [Member]
Accounting Policies [Line Items]
Restricted cash					$ 590,000	389,000
Held In Cash Money Market Account [Member]
Accounting Policies [Line Items]
Restricted cash						$ 6,000,000