Accounts Payable and Accrued Liabilities - Summary of Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts payable	$ 10,177	$ 9,072
Accrued price adjustments	2,207	1,094
Accrued rebates	2,581	231
Accrued chargebacks	65	14
Accrued compensation and benefits	1,917	945
Accrued royalties	431	770
Accrued clinical trial costs	584	36
Accrued manufacturing costs	183	427
Accrued sales and marketing costs	880	1,163
Accrued other	476	677
Total accounts payable and accrued expenses	$ 19,501	$ 14,429