Acquisition of ALF-X Surgical Robotic System - Summary of Fair Value Consideration (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended	12 Months Ended
	Sep. 21, 2015	Mar. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Contingent consideration		$ 24,356	$ 23,500
ALF-X Surgical Robotic System Acquisition [Member]
Business Acquisition [Line Items]
Common shares issued	15,543
Closing price per share	$ 2.81
Consideration share value	$ 43,677
Cash consideration	25,000
Contingent consideration	23,900	$ 24,400
Total consideration	$ 92,577