Accounts Payable and Accrued Liabilities - Summary of Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts payable	$ 8,247	$ 9,072
Accrued price adjustments	1,662	1,094
Accrued rebates	838	231
Accrued chargebacks	47	14
Accrued compensation and benefits	1,691	945
Accrued royalties	414	770
Accrued other	2,074	2,303
Total accounts payable and accrued expenses	$ 14,973	$ 14,429