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STOCK OPTIONS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 19, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Aug. 31, 2021 | Aug. 31, 2019 | Aug. 31, 2017 | Jul. 31, 2015 | Jul. 31, 2012 | Oct. 30, 2007 | Dec. 31, 2001
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option expiration period |  | 10 years |  |  |  |  |  |  |  |
Share-based compensation expense |  | $ 5,088 | $ 4,210 |  |  |  |  |  |  |
Closing stock price for computation of intrinsic value (in dollars per share) |  | $ 12.82 |  |  |  |  |  |  |  |
Stock options outstanding and expected to vest (in shares) |  | 5,037,248 |  |  |  |  |  |  |  |
Aggregate intrinsic value of all stock options outstanding and expected to vest |  | $ 35,560 |  |  |  |  |  |  |  |
Stock options outstanding and expected to vest, weighted average exercise price (in dollars per share) |  | $ 5.76 |  |  |  |  |  |  |  |
Stock options outstanding and exercisable, weighted average remaining contractual term |  | 6 years |  |  |  |  |  |  |  |
Stock options outstanding and exercisable (in shares) |  | 3,595,475 |  |  |  |  |  |  |  |
Aggregate intrinsic value of currently exercisable stock options |  | $ 29,460 |  |  |  |  |  |  |  |
Weighted average exercise price (in dollars per share) |  | $ 4.63 |  |  |  |  |  |  |  |
Weighted average remaining contractual term |  | 6 years |  |  |  |  |  |  |  |
Intrinsic value of options exercised |  | $ 1,600 | 200 |  |  |  |  |  |  |
Intrinsic value of options granted |  | $ 5,150 | $ 6,580 |  |  |  |  |  |  |
Weighted average grant date fair value of options granted (in dollars per share) |  | $ 5.76 | $ 4.78 |  |  |  |  |  |  |
Fair value of option shares vested |  | $ 4,270 | $ 2,510 |  |  |  |  |  |  |
Shares received in stock swaps (in shares) |  | 111,831 | 39,448 |  |  |  |  |  |  |
Shares issued in stock swaps (in shares) |  | 107,357 | 47,088 |  |  |  |  |  |  |
Unrecognized stock-based compensation cost |  | $ 5,010 |  |  |  |  |  |  |  |
Unrecognized stock-based compensation cost, recognition period |  | 1 year |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  | 1 year |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  | 7 years |  |  |  |  |  |  |  |
2001 Executive and Employee Stock Option Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized under common stock option plans (in shares) |  |  |  |  |  |  |  |  |  | 1,200,000
2003 Executive and Employee Stock Option Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized under common stock option plans (in shares) |  |  |  |  |  |  |  |  | 1,700,000 |
2012 Share Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized under common stock option plans (in shares) |  |  |  |  |  |  |  | 750,000 |  |
Remaining shares for issuance (in shares) |  | 70,000 |  |  |  |  |  |  |  |
2015 Executive and Employee Stock Option Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized under common stock option plans (in shares) |  |  |  |  |  |  | 2,000,000 |  |  |
Remaining shares for issuance (in shares) |  | 240,000 |  |  |  |  |  |  |  |
2017 Executive and Employee Stock Option Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized under common stock option plans (in shares) |  |  |  |  |  | 3,000,000 |  |  |  |
Remaining shares for issuance (in shares) |  | 80,000 |  |  |  |  |  |  |  |
2019 Share Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized under common stock option plans (in shares) |  |  |  |  | 2,000,000 |  |  |  |  |
Remaining shares for issuance (in shares) |  | 1,370,000 |  |  |  |  |  |  |  |
2021 Share Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized under common stock option plans (in shares) |  |  |  | 1,375,000 |  |  |  |  |  |
Remaining shares for issuance (in shares) |  | 1,375,000 |  |  |  |  |  |  |  |
2015 And 2019 Share Incentive Plan | Subsequent Event |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized under common stock option plans (in shares) | 1,500,000 |  |  |  |  |  |  |  |  |

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