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STOCK-BASED COMPENSATION - 2015 EIP Stock Options and Other (Details) - 2015 EIP Plan - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 23, 2021 | Feb. 25, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Mar. 19, 2021 | Mar. 18, 2021
Stock options |  |  |  |  |  |  |  |
Aggregate number of shares of common stock available for awards |  |  |  |  |  |  | 4,750,000 | 2,750,000
Stock Options |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |
Vesting percentage of awards | 33.33% |  |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  |  |  |  |
Unamortized compensation cost |  |  | $ 520 |  | $ 520 |  |  |
Future amortization of stock based compensation |  |  |  |  |  |  |  |
Remainder of 2021 |  |  | 153 |  | 153 |  |  |
2022 |  |  | 278 |  | 278 |  |  |
2023 |  |  | 81 |  | 81 |  |  |
2024 |  |  | $ 8 |  | $ 8 |  |  |
Number of Options |  |  |  |  |  |  |  |
Outstanding at beginning of period (in shares) |  |  |  |  | 837,338 |  |  |
Granted (in shares) | 118,552 | 344,568 |  |  | 118,552 |  |  |
Exercised (in shares) |  |  |  |  | (39,603) |  |  |
Outstanding at end of period (in shares) |  |  | 916,287 |  | 916,287 |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |
Outstanding at beginning of period (in dollars per share) |  |  |  |  | $ 8.86 |  |  |
Granted (in dollars per share) | $ 9.91 | $ 7.06 |  |  | 9.91 |  |  |
Exercised (in dollars per share) |  |  |  |  | 8.37 |  |  |
Outstanding at end of period (in dollars per share) |  |  | $ 9.02 |  | 9.02 |  |  |
Weighted Average Fair Value |  |  |  |  |  |  |  |
Outstanding at beginning of period (in dollars per share) |  |  |  |  | 4.02 |  |  |
Granted (in dollars per share) | $ 4.33 |  |  |  | 4.33 |  |  |
Exercised (in dollars per share) |  |  |  |  | 3.46 |  |  |
Outstanding at end of period (in dollars per share) |  |  | $ 4.08 |  | $ 4.08 |  |  |
Options outstanding and unvested |  |  | 427,318 |  | 427,318 |  |  |
Weighted Average Exercise Price Of Outstanding and Unvested Options |  |  |  |  | $ 8.04 |  |  |
Options Outstanding and Unvested, Weighted Average Remaining Contractual Life |  |  |  |  | 4 years 6 months |  |  |
Options Exercisable, Number of options |  |  | 488,969 |  | 488,969 |  |  |
Options Exercisable, Weighted Average Exercise Price |  |  | $ 9.88 |  | $ 9.88 |  |  |
Options Exercisable, Weighted Average Fair Value (in dollars per share) |  |  |  |  | $ 5.04 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Life |  |  |  |  | 2 years 10 months 6 days |  |  |
Aggregate fair value | $ 513 | $ 693 |  |  |  |  |  |
Stock options outstanding |  |  | 916,287 |  | 916,287 |  |  |
Assumptions and Methodology |  |  |  |  |  |  |  |
Weighted average volatility rate (as a percent) | 60.91% |  |  |  |  |  |  |
Risk-free interest rate ( as a percent) | 0.41% |  |  |  |  |  |  |
Dividend rate ( as a percent) | 0.98% |  |  |  |  |  |  |
Expected life (in years) | 4 years |  |  |  |  |  |  |
Stock Options | General and Administrative Expense |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |
Amortization expense |  |  | $ 152 | $ 195 | $ 483 | $ 592 |  |

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