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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - 2020 Incentive Plan - RSU - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Stock-based compensation |  |
Vesting period | 4 years |
Percentage of awards other than options vesting on the annual anniversary date of the grant | 25.00% | 25.00%
Number of shares granted | 0.1 |
Fair value of grant (in dollars per share) | $ 8.00 |
Tranche One |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) |  | $ 11.55
Minimum | Tranche One |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) |  | $ 4.36
Employee |  |
Stock-based compensation |  |
Number of shares granted |  | 1.0
Unrecognized compensation expense other than options | $ 2,700 | $ 4,900
Weighted average remaining vesting period | 2 years |
Fair value of grant (in dollars per share) |  | $ 6.13
Employee | Tranche One |  |
Stock-based compensation |  |
Vesting period |  | 4 years
Number of shares granted |  | 0.4
Employee | Tranche Two |  |
Stock-based compensation |  |
Number of shares granted |  | 0.2
Compensation expense recorded | $ 0 |
Fair value of grant (in dollars per share) |  | $ 11.32
Employee | Tranche Three |  |
Stock-based compensation |  |
Number of shares granted |  | 0.4
Fair value of grant (in dollars per share) |  | $ 6.48
Employee | Minimum | Tranche Two |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) |  | 7.88
Employee | Minimum | Tranche Three |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) |  | 4.05
Employee | Maximum | Tranche One |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) |  | 11.89
Employee | Maximum | Tranche Two |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) |  | 11.89
Employee | Maximum | Tranche Three |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) |  | $ 6.48
Non-employee director |  |
Stock-based compensation |  |
Weighted average remaining vesting period |  | 2 years 8 months 12 days

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