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STOCKHOLDERS' EQUITY - Stock-based compensation (Details) - Market-Based Awards
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares | shares 3,000,000
Grant Date Fair Value | $ / shares $ 3.66
Stock options.  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares | shares 1,500,000
Grant Date Fair Value | $ / shares $ 1.72
Restricted common stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares | shares 1,500,000
Grant Date Fair Value | $ / shares $ 1.94