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Subsequent Events (Details) - $ / shares
Feb. 14, 2022
Dec. 31, 2021
Dec. 31, 2020
Subsequent Event [Line Items]      
Common stock, par value (in dollars per share)   $ 0.001 $ 0.001
Collegium Pharmaceutical, Inc. | Subsequent Event | Purchaser      
Subsequent Event [Line Items]      
Commencement of cash tender offer (in business days) 10 days    
Common stock, par value (in dollars per share) $ 0.001    
Offer price (in dollars per share) $ 5.60    
Period cash tender offer remains open (in business days) 20 days    
Obligation to purchase outstanding shares in the cash tender offer (in shares) 1    
Number of shares of common stock issued and outstanding (percentage) 50.00%