Accounts Payable and Accrued Liabilities - Summary of Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accounts payable	$ 9,486	$ 9,397
Accrued price adjustments	2,220	592
Accrued returns	1,022
Accrued acquisition consideration	6,368
Accrued rebates	5,843	3,842
Accrued chargebacks	106	10
Accrued compensation and benefits	2,245	2,052
Accrued royalties	661	518
Accrued clinical trial costs	372	615
Accrued legal costs	1,299	490
Accrued manufacturing costs	200	200
Accrued sales and marketing costs		193
Accrued other	791	265
Total accounts payable and accrued expenses	$ 30,613	$ 18,174