REVENUES - Revenues from Major Customers (Details) - Revenue from Contract with Customer Benchmark - Customer Concentration Risk	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AmerisourceBergen Corporation
Revenue, Major Customer [Line Items]
Percentage of revenues	21.00%	21.00%	24.00%	21.00%
Cardinal Health, Inc.
Revenue, Major Customer [Line Items]
Percentage of revenues	23.00%	23.00%	21.00%	23.00%
McKesson Corporation
Revenue, Major Customer [Line Items]
Percentage of revenues	17.00%	23.00%	17.00%	22.00%