SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Major Customers (Details) - Customer concentration - customer	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Concentration risk, number of customers	3
Largest wholesaler | Sales Revenue, Net
Concentration Risk [Line Items]
Percentage of revenue from customers to total revenue	31.00%	31.00%	34.00%
Second largest wholesaler | Sales Revenue, Net
Concentration Risk [Line Items]
Percentage of revenue from customers to total revenue	28.00%	31.00%	29.00%
Third largest wholesaler | Sales Revenue, Net
Concentration Risk [Line Items]
Percentage of revenue from customers to total revenue	26.00%	25.00%	26.00%
Three largest customers | Sales Revenue, Net
Concentration Risk [Line Items]
Percentage of revenue from customers to total revenue	85.00%	87.00%	89.00%