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STOCK-BASED COMPENSATION - 2015 EIP Restricted Stock Units (Details) - 2015 EIP Plan - Restricted Stock Units - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
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May 13, 2021 | May 04, 2021 | Feb. 23, 2021 | Jul. 15, 2020 | Feb. 25, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Stock Awards |  |  |  |  |  |  |  |  |  |
Number of common shares outstanding in respect of RSUs |  |  |  |  |  | 478,848 |  | 478,848 |  | 373,588
Number of Shares |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  |  |  |  |  |  |  | 298,834 |  |
Granted (in shares) | 33,525 | 18,428 | 103,599 | 42,642 | 173,749 |  |  | 157,442 |  |
Vested (in shares) |  |  |  |  |  |  |  | (149,747) |  |
Balance at the end of the period (in shares) |  |  |  |  |  | 306,529 |  | 306,529 |  |
Number of shares vested |  |  |  |  |  | 655,644 |  | 655,644 |  |
Weighted Average Grant Date Price, Vested |  |  |  |  |  | $ 10.31 |  | $ 10.31 |  |
Weighted Average Fair Value |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  | 7.49 |  |
Granted (in dollars per share) |  |  |  |  |  |  |  | 11.90 |  |
Vested (in dollars per share) |  |  |  |  |  |  |  | 7.72 |  |
Balance at the end of the period (in dollars per share) |  |  |  |  |  | $ 9.65 |  | $ 9.65 |  |
Weighted-average remaining contractual life |  |  |  |  |  |  |  | 1 year 7 months 9 days |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Total fair value of shares vested |  |  |  |  |  |  |  | $ 1,814 | $ 548 |
Unrecognized compensation cost related to nonvested stock awards |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  |  | $ 1,504 |  | $ 1,504 |  |
Weighted-average period for recognition of unrecognized compensation cost |  |  |  |  |  |  |  | 1 year 7 months 9 days |  |
General and Administrative Expense |  |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Recognized nonvested stock amortization expense |  |  |  |  |  | $ 445 | $ 339 | $ 1,187 | $ 899 |
Other Individuals |  |  |  |  |  |  |  |  |  |
Stock Awards |  |  |  |  |  |  |  |  |  |
Vesting period of awards |  |  |  |  |  |  |  | 3 years |  |

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