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STOCK-BASED COMPENSATION - Narrative (Details) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Oct. 10, 2016 | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized for award (in shares) | shares |  | 20,803,838 |
Exercise price as percentage of fair market value | 1 |  |
Options expiration period | 10 years |  |
Number of common stock shares for each restricted stock unit and restricted stock unit award (in shares) | shares |  | 1 |
Exercises in period, intrinsic value |  | $ 1,200 | $ 100
Aggregate intrinsic value, vested |  | 300 | 200
Proceeds from exercise of stock options |  | 330 | $ 112
Option, cost not yet recognized |  | $ 1,100 |
Nonvested award, unrecognized, period for recognition |  | 2 years 9 months 18 days |
Expected dividend yield |  | 0.00% | 0.00%
Granted (in shares) | shares |  | 0 |
Award requisite service period |  | 4 years |
Restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Nonvested award, unrecognized, period for recognition |  | 3 years 4 months 24 days |
Grants in period, vested, grant date fair value |  | $ 100 | $ 100
Nonvested award, excluding options, unrecognized |  | $ 4,500 |
Granted (in shares) | shares |  | 3,379,467 |
Restricted Stock Units, Service And Performance Based |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Nonvested award, excluding options, unrecognized |  | $ 12,600 |
Granted (in shares) | shares |  | 2,700,000 |

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