ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Product Shipments and Accounts Receivable, By Distributor (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Customer concentration risk | Consolidated revenue
Concentration Risk [Line Items]
Total	100.00%	100.00%
Credit concentration risk | Accounts receivable related to product sales
Concentration Risk [Line Items]
Total	100.00%	100.00%
Cardinal Health | Customer concentration risk | Consolidated revenue
Concentration Risk [Line Items]
Total	34.00%	42.00%
Cardinal Health | Credit concentration risk | Accounts receivable related to product sales
Concentration Risk [Line Items]
Total	44.00%	53.00%
McKesson Corporation | Customer concentration risk | Consolidated revenue
Concentration Risk [Line Items]
Total	24.00%	14.00%
McKesson Corporation | Credit concentration risk | Accounts receivable related to product sales
Concentration Risk [Line Items]
Total	23.00%	20.00%
AmerisourceBergen Corporation | Customer concentration risk | Consolidated revenue
Concentration Risk [Line Items]
Total	26.00%	13.00%
AmerisourceBergen Corporation | Credit concentration risk | Accounts receivable related to product sales
Concentration Risk [Line Items]
Total	29.00%	18.00%
Collegium | Customer concentration risk | Consolidated revenue
Concentration Risk [Line Items]
Total	0.00%	11.00%
Collegium | Credit concentration risk | Accounts receivable related to product sales
Concentration Risk [Line Items]
Total	0.00%	0.00%
All others | Customer concentration risk | Consolidated revenue
Concentration Risk [Line Items]
Total	16.00%	20.00%
All others | Credit concentration risk | Accounts receivable related to product sales
Concentration Risk [Line Items]
Total	4.00%	9.00%