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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - 2020 Incentive Plan - RSU - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 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% |
Number of shares granted | 0.1 |
Fair value of grant (in dollars per share) | $ 8.00 |
Employee |  |
Stock-based compensation |  |
Number of shares granted |  | 0.9
Unrecognized compensation expense other than options | $ 3,600 | $ 6,400
Weighted average remaining vesting period | 2 years 6 months |
Employee | Tranche One |  |
Stock-based compensation |  |
Vesting period | 4 years |
Number of shares granted | 0.4 |
Fair value of grant (in dollars per share) | $ 11.89 |
Employee | Tranche Two |  |
Stock-based compensation |  |
Number of shares granted | 0.2 |
Compensation expense recorded | $ 0 |
Fair value of grant (in dollars per share) | $ 11.89 |
Employee | Tranche Three |  |
Stock-based compensation |  |
Number of shares granted | 0.3 |
Fair value of grant (in dollars per share) | $ 6.48 |
Non-employee director |  |
Stock-based compensation |  |
Weighted average remaining vesting period |  | 3 years 2 months 12 days

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