REVENUE RECOGNITION AND RELATED ALLOWANCES - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Revenue recognition	$ 64,477	$ 54,521
Sales of generic pharmaceutical products
Revenue recognition	49,107	32,988
Sales of established brand pharmaceutical products
Revenue recognition	8,452	7,517
Sales of rare disease pharmaceutical products
Revenue recognition	1,292
Sales of contract manufactured products
Revenue recognition	2,904	2,573
Royalties from licensing agreements
Revenue recognition	1,903	11,210
Product development services
Revenue recognition	566	158
Other
Revenue recognition	$ 253	$ 75

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details