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STOCKHOLDERS' EQUITY - Incentive Plans (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 08, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Jan. 29, 2020
Number of Shares |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 0 |  |  |
Restricted stock |  |  |  |  |  |  |
Unrecognized compensation expense stock option |  | $ 500,000 |  | $ 500,000 |  |  |
General and administrative |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Compensation expense recorded |  | $ 500,000 | $ 600,000 | $ 1,600,000 | $ 1,800,000 |  |
Stock options |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Percentage of awards vesting on the annual anniversary date of the grant |  |  |  | 25.00% |  |  |
Vesting period |  |  |  | 4 years |  |  |
Expiration term |  |  |  | 7 years |  |  |
Weighted average remaining vesting period |  |  |  | 1 year 6 months |  |  |
2020 Incentive Plan |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Aggregate number of shares available | 1,800,000 |  |  |  |  |  |
Increase in shares available for issuance | 300,000 |  |  |  |  |  |
2020 Incentive Plan | Common Stock |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Aggregate number of shares available |  |  |  |  |  |  | 1,500,000
Maximum number of shares that remained reserved for issuance under the Plan |  | 500,000 |  | 500,000 |  | 200,000 |
2020 Incentive Plan | Stock options |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Weighted average remaining vesting period |  |  |  |  | 2 years |  |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 600,000 |  |
Restricted stock |  |  |  |  |  |  |
Weighted average grant date fair value of the shares granted |  |  |  |  | $ 28.32 |  |
Unrecognized compensation expense stock option |  |  | $ 1,200,000 |  | $ 1,200,000 |  |
2020 Incentive Plan | Stock options | Minimum |  |  |  |  |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |
Exercised (in dollars per share) |  |  |  |  | $ 18.91 |  |
2020 Incentive Plan | Stock options | Maximum |  |  |  |  |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |
Exercised (in dollars per share) |  |  |  |  | $ 37.83 |  |

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