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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - RSU - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
2016 Incentive Plan |  |
Stock-based compensation |  |
Vesting period |  | 3 years
Percentage of awards other than options vesting on the annual anniversary date of the grant |  | 33.33%
2016 Incentive Plan | Employee |  |
Stock-based compensation |  |
Number of shares granted |  | 4.2
Unrecognized compensation expense other than options |  | $ 2,700
Weighted average remaining vesting period |  | 1 year 3 months 18 days
Fair value of grant (in dollars per share) |  | $ 1.29
2016 Incentive Plan | Employee | Minimum |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) |  | 1.29
2016 Incentive Plan | Employee | Maximum |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) |  | $ 1.40
2016 Incentive Plan | Non-employee director |  |
Stock-based compensation |  |
Vesting period |  | 6 months
2020 Incentive Plan |  |
Stock-based compensation |  |
Vesting period | 4 years |
Percentage of awards other than options vesting on the annual anniversary date of the grant | 25.00% |
2020 Incentive Plan | Minimum | Tranche One |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) | $ 4.36 |
2020 Incentive Plan | Maximum | Tranche One |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) | $ 11.89 |
2020 Incentive Plan | Employee |  |
Stock-based compensation |  |
Number of shares granted | 1.0 |
Unrecognized compensation expense other than options | $ 4,900 |
2020 Incentive Plan | Employee | Tranche One |  |
Stock-based compensation |  |
Vesting period | 4 years |
Number of shares granted | 0.4 |
Fair value of grant (in dollars per share) | $ 11.55 |
2020 Incentive Plan | 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 |
2020 Incentive Plan | Employee | Tranche Three |  |
Stock-based compensation |  |
Number of shares granted | 0.4 |
Fair value of grant (in dollars per share) | $ 6.13 |
2020 Incentive Plan | Employee | Minimum | Tranche Two |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) | 7.88 |
2020 Incentive Plan | Employee | Minimum | Tranche Three |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) | 4.05 |
2020 Incentive Plan | Employee | Maximum | Tranche Two |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) | 11.89 |
2020 Incentive Plan | Employee | Maximum | Tranche Three |  |
Stock-based compensation |  |
Fair value of grant (in dollars per share) | $ 6.48 |
2020 Incentive Plan | Non-employee director |  |
Stock-based compensation |  |
Weighted average remaining vesting period | 2 years 8 months 12 days |

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