Accounts Payable and Accrued Liabilities - Summary of Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accounts payable	$ 10,366	$ 10,177
Accrued price adjustments	236	317
Accrued rebates	4,906	4,471
Accrued chargebacks	34	65
Accrued compensation and benefits	1,366	1,917
Accrued royalties	427	431
Accrued clinical trial costs	247	584
Accrued manufacturing costs	308	183
Accrued sales and marketing costs	542	880
Accrued other	631	476
Total accounts payable and accrued expenses	$ 19,063	$ 19,501