Inventories - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Inventory Disclosure [Abstract]
Amounts credited to the allowance for obsolete inventory	$ 600	$ 100	$ 838	$ 256