REVENUE - Summary of Contract Assets and Liabilities (Details) - Contract asset - Collegium, net - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2018	Mar. 31, 2020
Contract With Customer, Asset [Roll Forward]
Contract asset, Beginning of Period		$ 1,896
Additions		0
Deductions		(1,896)
Contract asset, End of Period		$ 0
Contract liability	$ 10,000
Proceeds from issuance of warrants	$ 8,800