ACCOUNTS RECEIVABLES, NET - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts receivables
Total Accounts receivable, net	$ 44,350	$ 42,744
Receivables related to product sales, net
Accounts receivables
Total Accounts receivable, net	40,784	38,353
Receivables from Collegium
Accounts receivables
Total Accounts receivable, net	3,566	4,104
Other
Accounts receivables
Total Accounts receivable, net	$ 0	$ 287