REVENUE - Schedule of Disaggregated Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 111,014	$ 106,275
Product sales, net
Disaggregation of Revenue [Line Items]
Total revenues	109,420	92,090
INDOCIN Products
Disaggregation of Revenue [Line Items]
Total revenues	60,557	31,684
CAMBIA
Disaggregation of Revenue [Line Items]
Total revenues	24,972	28,350
Zipsor
Disaggregation of Revenue [Line Items]
Total revenues	10,185	13,286
SPRIX
Disaggregation of Revenue [Line Items]
Total revenues	8,676	11,077
Other products
Disaggregation of Revenue [Line Items]
Total revenues	5,030	7,693
Commercialization agreement revenue, net
Disaggregation of Revenue [Line Items]
Total revenues	0	11,258
Royalties and milestone revenue
Disaggregation of Revenue [Line Items]
Total revenues	2,579	1,519
Other revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ (985)	$ 1,408