ACCOUNTS RECEIVABLES, NET - Schedule of Accounts Receivables, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ACCOUNTS RECEIVABLES, NET
Total accounts receivable, net	$ 39,223	$ 42,744
Receivables from Collegium
ACCOUNTS RECEIVABLES, NET
Total accounts receivable, net	0	4,104
Receivables related to product sales, net
ACCOUNTS RECEIVABLES, NET
Total accounts receivable, net	38,502	38,353
Other
ACCOUNTS RECEIVABLES, NET
Total accounts receivable, net	$ 721	$ 287