REVENUE - Schedule of Disaggregated Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 35,627	$ 34,212	$ 119,084	$ 105,884
Total product sales, net
Disaggregation of Revenue [Line Items]
Total revenues	35,137	34,279	116,989	105,258
INDOCIN products
Disaggregation of Revenue [Line Items]
Total revenues	17,948	21,869	76,369	66,067
ROLVEDON
Disaggregation of Revenue [Line Items]
Total revenues	7,132	0	7,132	0
Otrexup
Disaggregation of Revenue [Line Items]
Total revenues	2,807	3,004	9,222	8,699
Sympazan
Disaggregation of Revenue [Line Items]
Total revenues	2,103	0	7,232	0
SPRIX
Disaggregation of Revenue [Line Items]
Total revenues	2,545	2,455	6,807	6,437
CAMBIA
Disaggregation of Revenue [Line Items]
Total revenues	1,993	5,808	6,062	17,464
Zipsor
Disaggregation of Revenue [Line Items]
Total revenues	597	259	2,751	2,704
Other products
Disaggregation of Revenue [Line Items]
Total revenues	12	884	1,414	3,887
Royalties and milestone revenue
Disaggregation of Revenue [Line Items]
Total revenues	490	473	1,910	1,916
Other revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ (540)	$ 185	$ (1,290)