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STOCK-BASED COMPENSATION - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) installment shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Stock options |  |  |
Shares authorized for issuance (in shares) | shares | 3,200,000 |  |
Shares available for issuance (in shares) | shares | 412,853 |  |
Common stock options exercised | $ 4,930 | $ 4,459 | $ 2,164
Fair value of stock options vested | $ 800 |  |
Stock options |  |  |
Stock options |  |  |
Vesting period | 5 years |  |
Expiration term | 10 years |  |
Intrinsic value of options exercised | $ 8,000 | $ 1,900 | $ 1,900
Unrecognized pre-tax compensation expense | $ 1,100 |  |
Unrecognized pre-tax compensation expense, recognition period | 3 years 1 month 6 days |  |
RSUs |  |  |
Stock options |  |  |
Unrecognized pre-tax compensation expense | $ 3,200 |  |
Unrecognized pre-tax compensation expense, recognition period | 2 years 7 months 6 days |  |
Granted (in shares) | shares | 66,872 |  |
Fair value of RSUs vested | $ 3,100 |  |
Time Based, Restricted Stock Units |  |  |
Stock options |  |  |
Vesting period | 5 years |  |
Granted (in shares) | shares | 41,348 |  |
Number of vesting installments | installment | 5 |  |
Time Based, Restricted Stock Units | Director |  |  |
Stock options |  |  |
Vesting period | 1 year |  |
Performance Based, Restricted Stock Units |  |  |
Stock options |  |  |
Vesting period | 3 years |  |
Granted (in shares) | shares | 25,524 |  |

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