Summary of Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Prepaid Expense And Other Assets Current [Abstract]
Manufacturing-related deposits	$ 12,934	$ 13,070
Prepaid expenses	2,880	3,109
Other	1,071	1,201
Total other current assets	$ 16,885	$ 17,380