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STOCK OPTIONS - Narrative (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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Jan. 15, 2020 shares | Oct. 31, 2015 shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) employee $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Aug. 31, 2019 shares | Aug. 31, 2017 shares | Jul. 31, 2015 shares | Jul. 31, 2012 shares | Oct. 30, 2007 shares | Dec. 31, 2001 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Option expiration period |  |  | 10 years |  |  |  |  |  |  |  |
Option vesting period |  |  | 7 years |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 1,379,500 | 225,000 | 1,728,000 |  |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 3,581 | $ 2,224 | $ 871 |  |  |  |  |  |
Closing stock price for computation of intrinsic value (in dollars per share) | $ / shares |  |  | $ 8.46 |  |  |  |  |  |  |  |
Stock options outstanding and expected to vest (in shares) |  |  | 3,772,139 |  |  |  |  |  |  |  |
Aggregate intrinsic value of all stock options outstanding and expected to vest | $ |  |  | $ 14,820 |  |  |  |  |  |  |  |
Stock options outstanding and expected to vest, weighted average exercise price (in dollars per share) | $ / shares |  |  | $ 4.53 |  |  |  |  |  |  |  |
Stock options outstanding and exercisable (in shares) |  |  | 2,481,929 |  |  |  |  |  |  |  |
Aggregate intrinsic value of currently exercisable stock options | $ |  |  | $ 12,730 |  |  |  |  |  |  |  |
Weighted average exercise price (in dollars per share) | $ / shares |  |  | $ 3.33 |  |  |  |  |  |  |  |
Weighted average remaining contractual term |  |  | 6 years |  |  |  |  |  |  |  |
Stock options outstanding and exercisable, weighted average remaining contractual term |  |  | 7 years |  |  |  |  |  |  |  |
Intrinsic value of options exercised | $ |  |  | $ 1,420 | 4,460 | 220 |  |  |  |  |  |
Intrinsic value of options granted | $ |  |  | $ 6,300 | $ 540 | $ 3,140 |  |  |  |  |  |
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares |  |  | $ 4.57 | $ 2.40 | $ 1.82 |  |  |  |  |  |
Fair value of option shares vested | $ |  |  | $ 2,130 | $ 1,440 | $ 810 |  |  |  |  |  |
Shares issued in stock swaps (in shares) |  |  | 222,601 | 720,772 | 47,372 |  |  |  |  |  |
Shares surrendered in period (in shares) |  |  |  | 22,711 | 34,687 |  |  |  |  |  |
Stock swap to acquire options (in shares) |  |  |  | 17,289 | 19,688 |  |  |  |  |  |
Number of employees, modified vesting terms | employee |  |  |  | 2 |  |  |  |  |  |  |
Compensation costs | $ |  |  |  | $ 190 |  |  |  |  |  |  |
Unrecognized stock-based compensation cost | $ |  |  | $ 3,520 |  |  |  |  |  |  |  |
Unrecognized stock-based compensation cost, recognition period |  |  | 1 year |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares received in stock swaps (in shares) |  |  | 125,948 | 570,343 | 129,378 |  |  |  |  |  |
Restricted |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Option vesting period |  | 5 years |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation cost | $ |  |  | $ 70 |  |  |  |  |  |  |  |
Grants to date (in shares) |  | 225,922 |  |  |  |  |  |  |  |  |
Shares vested to date (in shares) |  |  | 180,740 |  |  |  |  |  |  |  |
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) |  |  | 160,000 |  |  |  |  |  |  |  |
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) |  |  | 900,000 |  |  |  |  |  |  |  |
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) |  |  | 480,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Option vesting period | 3 years |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 1,300,000 |  |  |  |  |  |  |  |  |  |

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