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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2020 | Dec. 31, 2020 | Mar. 20, 2020
Fortis |  |  |
Loss Contingencies [Line Items] |  |  |
Loss contingency, damages sought | $ 30.0 |  |
Hong Kong Pharma Tainuo Ltd. | Flexion |  |  |
Loss Contingencies [Line Items] |  |  |
Proceeds from development and commercialization of ZILRETTA |  | $ 10.0 |
Maximum milestone payment to be received |  |  | $ 32.5

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