REVENUE - Schedule of Disaggregated Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 35,131	$ 25,373	$ 71,670	$ 52,213
Total product sales, net
Disaggregation of Revenue [Line Items]
Total revenues	35,430	25,244	70,977	51,274
INDOCIN products
Disaggregation of Revenue [Line Items]
Total revenues	22,841	13,075	44,197	27,673
CAMBIA
Disaggregation of Revenue [Line Items]
Total revenues	6,183	6,128	11,656	12,590
Otrexup
Disaggregation of Revenue [Line Items]
Total revenues	2,616	0	5,694	0
Zipsor
Disaggregation of Revenue [Line Items]
Total revenues	216	2,581	2,445	4,803
SPRIX
Disaggregation of Revenue [Line Items]
Total revenues	2,216	2,942	3,982	4,639
Other products
Disaggregation of Revenue [Line Items]
Total revenues	1,358	518	3,003	1,569
Royalties and milestones
Disaggregation of Revenue [Line Items]
Total revenues	451	542	1,443	975
Other revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ (750)	$ (413)	$ (750)	$ (36)