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DESCRIPTION OF BUSINESS (Details) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 product segment $ / shares | Oct. 22, 2021 $ / shares shares | Dec. 31, 2020 $ / shares
Concentration Risk [Line Items] |  |  |
Flexion common stock, par value | $ 0.001 |  | $ 0.001
Number of reportable segments | segment | 1 |  |
Flexion | Subsequent Event |  |  |
Concentration Risk [Line Items] |  |  |
Flexion common stock, par value |  | $ 0.001 |
Offer price, per Flexion Share |  | $ 8.5 |
Contingent value right, per Flexion Share | shares |  | 1 |
Additional contingent payment, share price |  | $ 8.00 |
Sales Revenue, Net | Product Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration of products (in products) | product | 2 |  |

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