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Commitments and Contingencies - Additional Information (Detail) € in Millions				9 Months Ended		12 Months Ended
	Jan. 04, 2017 EUR (€)	Dec. 30, 2016 EUR (€) shares	Sep. 21, 2015 shares	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Operating Leased Assets [Line Items]
Fair value of contingent consideration				$ 12,104,000		$ 12,418,000
Liability or related charge recorded for legal contingencies				0		0
Senhance Surgical Robotic System Acquisition [Member]
Operating Leased Assets [Line Items]
Contingent consideration related to acquisition				100,000	$ 1,200,000
Common shares issued \| shares			15,543,413
Fair value of contingent consideration				$ 12,100,000		$ 12,400,000
Senhance Surgical Robotic System Acquisition [Member] \| Second Tranche [Member]
Operating Leased Assets [Line Items]
Contingent consideration related to acquisition \| €		€ (5.0)
Common shares issued \| shares		3,722,685
Aggregate fair market value of common stock \| €		€ 5.0
Fair value of contingent consideration \| €	€ 5.0