Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Healthpoint Capital [Member]
Related Party Transaction [Line Items]
Company incurred costs (less than $0.1 million in 2015)	$ 0.1	$ 0.2	$ 0.2
Orthotec LLC, Litigation Settlement [Member] | Indemnification Agreement [Member]
Related Party Transaction [Line Items]
Indemnification obligation payments (less than $0.1 million in 2015 and 2014)	$ 0.1	$ 0.1	$ 1.7