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STOCK COMPENSATION PLAN (Details) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
May 18, 2019 | Jan. 01, 2019 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | May 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Outstanding shares |  |  | 231,000 | 231,000 |  |
Exercise of stock options (in shares) |  |  | 0 |  |  |
Restricted Stock Units | Key Personnel |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares, Granted |  |  | 78,582 |  |  |
Vesting period |  |  | 3 years |  |  |
Restricted stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to non-vested stock options |  |  | $ 5,700,000 |  |  |
Compensation cost related to stock awards |  |  | $ 476,000 |  | $ 354,000 |
Number of shares, Granted |  |  | 78,582 | 1,785 |  |
Unrecognized compensation expense recognition period |  |  | 2 years 5 months 15 days |  |  |
Fair value of shares vested |  |  | $ 360,000 |  |  |
Restricted stock | Non-employee directors |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to non-vested stock options |  |  | 330,000 |  |  |
Compensation cost related to stock awards |  |  | $ 110,000 |  | 100,000 |
Number of shares, Granted |  | 38,900 |  |  |  |
Service period (in years) |  |  | 3 years |  |  |
Vesting period |  |  | 3 years |  |  |
Unrecognized compensation expense recognition period |  |  | 9 months |  |  |
Performance-Based Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation cost related to stock awards |  |  | $ 0 |  | 358,000 |
Number of shares, Granted |  |  | 0 |  |  |
Performance period (in years) |  |  | 3 years |  |  |
Number of PRSUs awarded |  |  | 90,000 |  |  |
Equity Incentive Plan 2019 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based payment award, shares authorized, maximum |  |  |  |  |  | 340,000
Equity Incentive Plan 2019 | Stock Option | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of exercise price to the fair market value |  |  | 100.00% |  |  |
Equity Incentive Plan 2019 | Incentive stock options granted to any 10% stockholder | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of the exercise price to the fair market value of the shares covered by the stock option on the date of grant in the case of an ISO granted to 10% stockholder |  |  | 110.00% |  |  |
Equity Incentive Plan 2009 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Outstanding shares |  |  |  |  |  | 468,382
Number of shares expired | 628,719 |  |  |  |  |
Compensation cost related to stock awards |  |  | $ 0 |  | $ 0 |
Equity Incentive Plan 2009 | Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to non-vested stock options |  |  | $ 0 | $ 0 |  |
Equity Incentive Plan 2009 | Equity Incentive Plan | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based payment award, exercise period from the grant date |  |  | 10 years |  |  |
Equity Incentive Plan 2009 | Incentive stock options | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based payment award, exercise period from the grant date |  |  | 5 years |  |  |

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