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STOCK OPTIONS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 29, 2020 | Oct. 31, 2015 | Dec. 31, 2020 | Dec. 31, 2019 | 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 |  |  |  |  |  |  |
Option vesting period | 3 years |  |  |  |  |  |  |  |  |
Granted (in shares) | 700,000 |  | 1,376,900 | 1,379,500 |  |  |  |  |  |
Share-based compensation expense |  |  | $ 4,210 | $ 3,581 |  |  |  |  |  |
Closing stock price for computation of intrinsic value (in dollars per share) |  |  | $ 7.20 |  |  |  |  |  |  |
Stock options outstanding and expected to vest (in shares) |  |  | 4,530,049 |  |  |  |  |  |  |
Aggregate intrinsic value of all stock options outstanding and expected to vest |  |  | $ 10,250 |  |  |  |  |  |  |
Stock options outstanding and expected to vest, weighted average exercise price (in dollars per share) |  |  | $ 5.26 |  |  |  |  |  |  |
Stock options outstanding and exercisable, weighted average remaining contractual term |  |  | 7 years |  |  |  |  |  |  |
Stock options outstanding and exercisable (in shares) |  |  | 2,894,474 |  |  |  |  |  |  |
Aggregate intrinsic value of currently exercisable stock options |  |  | $ 9,800 |  |  |  |  |  |  |
Weighted average exercise price (in dollars per share) |  |  | $ 3.89 |  |  |  |  |  |  |
Weighted average remaining contractual term |  |  | 6 years |  |  |  |  |  |  |
Intrinsic value of options exercised |  |  | $ 200 | 1,420 |  |  |  |  |  |
Intrinsic value of options granted |  |  | $ 6,580 | $ 6,300 |  |  |  |  |  |
Weighted average grant date fair value of options granted (in dollars per share) |  |  | $ 4.78 | $ 4.57 |  |  |  |  |  |
Fair value of option shares vested |  |  | $ 2,510 | $ 2,130 |  |  |  |  |  |
Shares received in stock swaps (in shares) |  |  | 39,448 | 125,948 |  |  |  |  |  |
Shares issued in stock swaps (in shares) |  |  | 47,088 | 222,601 |  |  |  |  |  |
Unrecognized stock-based compensation cost |  |  | $ 5,910 |  |  |  |  |  |  |
Unrecognized stock-based compensation cost, recognition period |  |  | 1 year |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option vesting period |  |  | 1 year |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option vesting period |  |  | 7 years |  |  |  |  |  |  |
Restricted |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Option vesting period |  | 5 years |  |  |  |  |  |  |  |
Grants to date (in shares) |  | 225,922 |  |  |  |  |  |  |  |
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) |  |  | 60,000 |  |  |  |  |  |  |
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) |  |  | 230,000 |  |  |  |  |  |  |
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) |  |  | 70,000 |  |  |  |  |  |  |
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) |  |  | 2,000,000 |  |  |  |  |  |  |

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