Accounts Payable and Accrued Liabilities - Summary of Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts payable	$ 7,670	$ 9,072
Accrued price adjustments	1,685	1,094
Accrued rebates	332	231
Accrued chargebacks	34	14
Accrued compensation and benefits	1,053	945
Accrued royalties	445	770
Accrued other	1,044	2,303
Total accounts payable and accrued expenses	$ 12,263	$ 14,429