REVENUE - Commercialization Agreement Revenue, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Collaboration and License Agreements
Total revenues	$ 111,014	$ 106,275
Collegium Pharmaceutical Inc. | Amended Commercialization Agreement
Collaboration and License Agreements
Total revenues		11,300
Contract asset, amortization		1,800
Royalty | Collegium Pharmaceutical Inc. | Amended Commercialization Agreement
Collaboration and License Agreements
Total revenues		$ 13,100