Commitments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]
Rent expenses	$ 3.0	$ 3.4	$ 3.4
Inventory purchase commitments with third-party	$ 1.1	$ 2.5	$ 3.0