Inventories - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Finished goods	$ 2,250	$ 2,704
Raw materials		1,928
Total inventories	2,250	4,632
Short-term portion	$ 2,250	3,923
Long-term portion		$ 709