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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 27, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options outstanding (shares) | 71,700 |  | 72,300 | 78,100 |
2008 Equity Incentive Plan and 2018 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense related to awards | $ 3 | $ 4 |  |  |
2008 Equity Incentive Plan and 2018 Equity Incentive Plan | Restricted stock awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense related to awards | $ 171 | $ 139 |  |  |
2018 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock reserved and available for issuance (shares) |  |  |  |  | 350,000
2018 Equity Incentive Plan | Restricted stock awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Non-option instruments outstanding (shares) | 163,974 |  |  |  |
2018 Equity Incentive Plan | Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options outstanding (shares) | 0 |  |  |  |
2008 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Term of Equity Incentive Plan | 10 years |  |  |  |
Options granted (shares) | 71,700 |  |  |  |
Expiry period of unexercised incentive stock options | 10 years |  |  |  |
2008 Equity Incentive Plan | Restricted stock awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Non-option instruments granted (shares) | 3,619 |  |  |  |
2008 Equity Incentive Plan | Restricted stock awards | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period of shares, in years | 2 years |  |  |  |
2008 Equity Incentive Plan | Restricted stock awards | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period of shares, in years | 5 years |  |  |  |
2008 Equity Incentive Plan | Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period of shares, in years | 5 years |  |  |  |

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