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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