Accounts Payable and Accrued Liabilities - Summary of Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accounts payable	$ 10,533	$ 10,177
Accrued price adjustments	442	317
Accrued rebates	4,120	4,471
Accrued chargebacks	15	65
Accrued compensation and benefits	2,314	1,917
Accrued royalties	410	431
Accrued clinical trial costs	128	584
Accrued manufacturing costs	200	183
Accrued sales and marketing costs	8	880
Accrued other	669	476
Total accounts payable and accrued expenses	$ 18,839	$ 19,501