DISPOSITIONS - Sale of Gralise (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Jan. 10, 2020	Jun. 30, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Co-promotion service income				$ 243	$ (3,225)
Gralise | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received, including base purchase price and inventory adjustment	$ 78,600
Consideration received, base purchase price	75,000
Consideration received, inventory adjustment upon disposal	$ 3,600
Consideration receivable as percentage of net sales after closing	75.00%
Threshold for consideration receivable on net sales after closing	$ 70,000
Gain (loss) on sale					(900)
Contingent consideration, payments received					$ 51,600
Gain (loss) on disposal		$ 126,600
Net sale after closing, contingent consideration	$ 51,600
Co-promotion service income			$ 1,300