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STOCKHOLDERS' EQUITY - Schedule of Share-based Compensation, Stock Options Reserved for Future Issuance (Details) - shares
Dec. 31, 2020
Mar. 10, 2020
Stockholders' Equity Note [Abstract]    
Options and RSUs outstanding (in shares) 1,713,000  
Shares available for future grant (in shares) 1,244,000 364,446
Shares reserved (in shares) 2,957,000