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Commitments and Contingencies - Additional Information (Detail) € in Millions			9 Months Ended		12 Months Ended
	Dec. 30, 2016 EUR (€) shares	Sep. 21, 2015 shares	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Contingent consideration related to acquisition			$ 9,700,000	$ (100,000)
Liability or related charge recorded for legal contingencies			0		$ 0
Senhance Surgical Robotic System Acquisition
Operating Leased Assets [Line Items]
Common shares issued (in shares) \| shares		15,543,413
Fair value of contingent consideration			$ 900,000		$ 10,600,000
Senhance Surgical Robotic System Acquisition \| Second Tranche
Operating Leased Assets [Line Items]
Contingent consideration related to acquisition \| €	€ 5.0
Common shares issued (in shares) \| shares	3,722,685
Aggregate fair market value of common stock \| €	€ 5.0