Accounts Payable and Accrued Liabilities - Summary of Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accounts payable	$ 12,481	$ 10,177
Accrued price adjustments	632	317
Accrued rebates	2,682	4,471
Accrued chargebacks	27	65
Accrued compensation and benefits	2,147	1,917
Accrued royalties	393	431
Accrued clinical trial costs	236	584
Accrued manufacturing costs	200	183
Accrued sales and marketing costs		880
Accrued other	261	476
Total accounts payable and accrued expenses	$ 19,059	$ 19,501