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REVENUES - Revenues from Major Customers (Details) - Revenue from Contract with Customer Benchmark - Customer Concentration Risk | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
AmerisourceBergen Corporation |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenues | 25.00% | 30.00% | 24.00% | 25.00%
Cardinal Health, Inc. |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenues | 22.00% | 19.00% | 21.00% | 22.00%
McKesson Corporation |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenues | 21.00% | 22.00% | 18.00% | 22.00%

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