REVENUE - Schedule of Disaggregated Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 36,538	$ 26,839
Total product sales, net
Disaggregation of Revenue [Line Items]
Total revenues	35,546	26,027
INDOCIN products
Disaggregation of Revenue [Line Items]
Total revenues	21,357	14,597
CAMBIA
Disaggregation of Revenue [Line Items]
Total revenues	5,473	6,462
Otrexup
Disaggregation of Revenue [Line Items]
Total revenues	3,078	0
Zipsor
Disaggregation of Revenue [Line Items]
Total revenues	2,228	2,222
SPRIX
Disaggregation of Revenue [Line Items]
Total revenues	1,766	1,697
Other products
Disaggregation of Revenue [Line Items]
Total revenues	1,644	1,049
Royalties and milestones
Disaggregation of Revenue [Line Items]
Total revenues	992	434
Other revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 378