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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -Share Based Compensation (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) $ / shares $ / EquityUnit shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares $ / EquityUnit shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation | $ |  |  | $ 5,291 | $ 4,734 |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares of unvested restricted stock outstanding (in shares) | shares | 952,971 |  | 952,971 |  | 1,038,006
Weighted average grant date fair value of stock grants per share (in dollars per share) | $ / shares | $ 5.74 |  | $ 5.74 |  |
Unrecognized compensation cost related to unvested restricted stock | $ | $ 4,700 |  | $ 4,700 |  |
Period in which compensation cost expected to be recognized |  |  | 1 year 10 months 24 days |  |
PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period in which compensation cost expected to be recognized |  |  | 1 year 9 months 18 days |  |
Number of performance stock units ("PSUs") outstanding (in shares) | shares | 1,049,910 |  | 1,049,910 |  |
Weighted average grant date fair value of PSUs per unit (in dollars per share) | $ / EquityUnit | 8.11 |  | 8.11 |  |
Minimum final number of shares of common stock issuable based on performance multiplier (in shares) | shares |  |  | 0 |  |
Maximum final number of shares of common stock issuable based on performance multiplier (in shares) | shares |  |  | 2,099,820 |  |
Unrecognized expense, performance share units | $ |  |  | $ 4,200 |  |
General and Administrative Expense |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation | $ | $ 1,800 | $ 1,800 | $ 5,300 | $ 4,700 |

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