INTANGIBLE ASSETS - Summary of Gross Carrying Amounts and Net Book Values of Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Intangible assets
Gross Carrying Amount	$ 316,096	$ 316,096
Accumulated Amortization	(108,542)	(100,042)
Total	$ 207,554	216,054
INDOCIN | Product Rights
Intangible assets
Remaining useful life	10 years 1 month 6 days
Gross Carrying Amount	$ 154,100	154,100
Accumulated Amortization	(23,864)	(20,654)
Total	$ 130,236	133,446
Otrexup | Product Rights
Intangible assets
Remaining useful life	7 years 8 months 12 days
Gross Carrying Amount	$ 44,086	44,086
Accumulated Amortization	(1,377)	0
Total	$ 42,709	44,086
SPRIX | Product Rights
Intangible assets
Remaining useful life	5 years 1 month 6 days
Gross Carrying Amount	$ 39,000	39,000
Accumulated Amortization	(10,354)	(8,960)
Total	$ 28,646	30,040
CAMBIA | Product Rights
Intangible assets
Remaining useful life	9 months 18 days
Gross Carrying Amount	$ 51,360	51,360
Accumulated Amortization	(45,397)	(43,410)
Total	5,963	7,950
Zipsor | Product Rights
Intangible assets
Gross Carrying Amount	27,250	27,250
Accumulated Amortization	(27,250)	(26,718)
Total	0	532
OXAYDO | Product Rights
Intangible assets
Gross Carrying Amount	300	300
Accumulated Amortization	(300)	(300)
Total	$ 0	$ 0