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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 31, 2020 | Feb. 28, 2017 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Loss Contingencies [Line Items] |  |  |  |  |  |
Restructuring charges |  |  | $ 936 | $ 0 | $ 936 | $ 0
Fortis |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency, damages sought | $ 30,000 |  |  |  |  |
GeneQuine | Flexion | Achievement of Development and Regulatory Milestones |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Maximum milestone payment to be received |  | $ 56,000 |  |  |  |
Estimate of restructuring costs, once probable |  | 4,500 |  |  |  |
Restructuring charges |  | $ 51,500 |  |  |  |

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