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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Oct. 01, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Stock-based compensation |  |  |  |
Number of shares granted |  | 4,163,348 | 987,590 | 2,326,961
Aggregate grant date fair value of the shares granted |  | $ 5.4 |  |
Employees and non-employee directors |  |  |  |
Stock-based compensation |  |  |  |
Number of shares granted | 0 |  |  |
2016 Incentive Plan | Restricted Stock |  |  |  |
Stock-based compensation |  |  |  |
Vesting period |  |  | 3 years |
Aggregate grant date fair value of the shares granted |  |  |  | $ 12.7
Unrecognized compensation expense other than options |  |  |  | $ 6.1
Weighted average remaining vesting period |  |  |  | 1 year 1 month 6 days
2016 Incentive Plan | Restricted Stock | Non-employee director |  |  |  |
Stock-based compensation |  |  |  |
Vesting period |  |  | 6 months |
2020 Incentive Plan | Employee | Tranche One |  |  |  |
Stock-based compensation |  |  |  |
Vesting period |  |  | 4 years |
Number of shares granted |  |  | 400,000 |
2020 Incentive Plan | Restricted Stock |  |  |  |
Stock-based compensation |  |  |  |
Vesting period |  |  | 4 years |
2020 Incentive Plan | Restricted Stock | Employee |  |  |  |
Stock-based compensation |  |  |  |
Number of shares granted |  |  | 1,000,000 |
Unrecognized compensation expense other than options |  |  | $ 4.1 |
2020 Incentive Plan | Restricted Stock | Employee | Tranche One |  |  |  |
Stock-based compensation |  |  |  |
Aggregate average grant date fair value |  |  | $ 5.0 |
2020 Incentive Plan | Restricted Stock | Employee | Tranche Two |  |  |  |
Stock-based compensation |  |  |  |
Number of shares granted |  |  | 200,000 |
Aggregate average grant date fair value |  |  | $ 2.1 |
Compensation expense recorded |  |  | $ 0.0 |
2020 Incentive Plan | Restricted Stock | Employee | Tranche Three |  |  |  |
Stock-based compensation |  |  |  |
Number of shares granted |  |  | 400,000 |
Aggregate average grant date fair value |  |  | $ 2.3 |
2020 Incentive Plan | Restricted Stock | Non-employee director |  |  |  |
Stock-based compensation |  |  |  |
Weighted average remaining vesting period |  |  | 2 years 6 months |

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- Definition The aggregate weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan) granted during the period. + References No definition available. + Details
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