Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 3,966	$ 7,978
Work-in-process	11,564	9,505
Finished products	47,109	42,434
Deferred cost of sales	3,632	3,429
Total inventory	$ 66,271	$ 63,346