Number of shares of equity interests issued or issuable to acquire entity.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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Fair value of equity issued in a business combination.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Commitments and Contingencies - Additional Information (Detail) € in Millions					3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) shares	Jan. 04, 2017 EUR (€)	Dec. 30, 2016 EUR (€) shares	Sep. 21, 2015 shares	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items]
Fair value of contingent consideration \| $					$ 18,800,000		$ 22,800,000
Liability or related charge recorded for legal contingencies \| $	$ 0				0		0
Senhance Surgical Robotic System Acquisition [Member]
Operating Leased Assets [Line Items]
Contingent consideration related to acquisition \| $					$ 1,227,000	$ 856,000
Common shares issued \| shares				15,543,413
Fair value of contingent consideration \| $	$ 18,800,000						$ 22,800,000
Senhance Surgical Robotic System Acquisition [Member] \| Common Stock [Member]
Operating Leased Assets [Line Items]
Common shares issued \| shares	3,722,685
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
Senhance Surgical Robotic System Acquisition [Member] \| Second Tranche [Member] \| Common Stock [Member]
Operating Leased Assets [Line Items]
Common shares issued \| shares			3,722,685