Summary of Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Prepaid Expense And Other Assets Current [Abstract]
Manufacturing-related deposits	$ 16,783	$ 13,070
Prepaid expenses	3,663	3,109
Other	1,556	1,201
Total other current assets	$ 22,002	$ 17,380