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STOCKHOLDERS' EQUITY - Schedule of Share-based Compensation, RSUs (Details) - Restricted Stock Units (RSUs)
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Shares  
Outstanding at the beginning of the year (in shares) | shares 70,000
Granted (in shares) | shares 597,000
Released (in shares) | shares (76,000)
Forfeited (in shares) | shares (150,000)
Outstanding at the end of the year (in shares) | shares 441,000
Weighted Average Grant-Date Fair Value  
Outstanding at the beginning of the year (in USD per share) | $ / shares $ 11.52
Granted (in USD per share) | $ / shares 5.32
Released (in USD per share) | $ / shares 6.86
Forfeited (in USD per share) | $ / shares 5.47
Outstanding at the end of the year (in USD per share) | $ / shares $ 5.99