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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended | 70 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | May 18, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation | $ 4,509 | $ 9,036 | $ 10,169 |  |
Compensation costs not yet recognized | $ 10,900 |  |  | $ 10,900 |
Compensation costs not yet recognized, period for recognition | 1 year 9 months 18 days |  |  |  |
Intrinsic value of options exercised | $ 500 | $ 500 | $ 1,500 |  |
Omnibus Incentive Plan 2017 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  | 3,150,000
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options granted (in shares) | 1,010,802 | 853,994 | 593,705 |  |
Grant date fair value | $ 12,600 | $ 13,000 | $ 14,600 |  |
Vested in period, fair value | $ 3,700 | $ 7,400 | $ 15,000 |  |
Restricted Stock | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 1 year |  |  |  |
Restricted Stock | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 3 years |  |  |  |
Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 3 years |  |  |  |
Options granted (in shares) |  |  |  | 0 |
Expiration period | 10 years |  |  |  |

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