Acquisition of Senhance Surgical Robotic System - Summary of Fair Value Consideration (Detail) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Sep. 21, 2015 USD ($) $ / shares shares	Nov. 30, 2016 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Contingent consideration			$ 22,800	$ 23,500
Senhance Surgical Robotic System Acquisition [Member]
Business Acquisition [Line Items]
Common shares issued | shares	15,543,413
Closing price per share | $ / shares	$ 2.81
Consideration share value	$ 43,677
Cash consideration	25,000
Contingent consideration	23,900		$ 22,800
Total consideration	$ 92,577	€ 375,000