REVENUES - Disaggregated (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 149,236	$ 108,621	$ 59,288
Gross product sales
Disaggregation of Revenue [Line Items]
Total revenues	81,186	76,470	53,082
Discounts and allowances
Disaggregation of Revenue [Line Items]
Total revenues	(18,176)	(14,774)	(9,310)
Product sales, net
Disaggregation of Revenue [Line Items]
Total revenues	63,010	61,696	43,772
License revenues
Disaggregation of Revenue [Line Items]
Total revenues	70,553	40,358	8,696
Development milestones
Disaggregation of Revenue [Line Items]
Total revenues	1,875	2,100	5,500
Research and development services and others
Disaggregation of Revenue [Line Items]
Total revenues	3,298	4,467	1,320
Contract revenues from collaborations
Disaggregation of Revenue [Line Items]
Total revenues	75,726	$ 46,925	$ 15,516
Government contract
Disaggregation of Revenue [Line Items]
Total revenues	$ 10,500