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STOCK OPTIONS - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 01, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost, nonvested options |  | $ 2,069 |  |
Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Contractual term | 10 years |  |  |
Unrecognized compensation cost, nonvested options, period for recognition |  | 3 years 5 months 8 days |  |
Restricted Stock | Minimum | Employees |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 5 years |  |
2015 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares permitted for grant (in shares) |  | 1,000,000 |  |
2015 Equity Incentive Plan | Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Contractual term |  | 10 years |  |
Share-based compensation expense |  | $ 663 | $ 592 | $ 355
2015 Equity Incentive Plan | Option | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 5 years |  |
2015 Equity Incentive Plan | Option | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 10 years |  |

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