Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Accounts payable	$ 7,033	$ 4,213
Accrued rebates	38,179	34,247
Accrued compensation and benefits	6,832	5,488
Accrued returns	8,009	5,128
Accrued royalties	1,138	704
Taxes payable	583	1,026
Accrued legal	1,819	515
Accrued regulatory expenses	294	397
Product rights payable	9,000	0
Accrued other	1,693	1,277
Total accounts payable and accrued liabilities	$ 74,580	$ 52,995