Accounts Payable and Accrued Liabilities - Summary of Components (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accounts payable	$ 11,704	$ 3,166
Accrued rebates	28,528	12,261
Accrued compensation and benefits	5,545	3,814
Accrued acquisition costs	0	318
Accrued returns	4,438	715
Accrued royalties	535	159
Accrued clinical trial costs	0	464
Accrued regulatory fees	331	0
Accrued legal	1,484	70
Accrued other	1,428	572
Total accounts payable and accrued expenses	$ 53,993	$ 21,539