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STOCK COMPENSATION PLAN (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | May 28, 2019 | May 18, 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 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost related to non-vested stock options |  | $ 2,000,000.0 |  |  |
Compensation cost related to stock awards |  | $ 1,500,000 | $ 1,200,000 |  |
Number of shares, Granted | 60,307 | 62,092 | 106,423 |  |
Vesting period |  | 3 years |  |  |
Unrecognized compensation expense recognition period |  | 1 year 8 months 4 days |  |  |
Fair value of shares vested |  | $ 2,100,000 | $ 2,400,000 |  |
Restricted stock | Non-employee directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation cost related to stock awards |  | $ 410,000 | 400,000 |  |
Number of shares, Granted |  | 3,890,000 |  |  |
Vesting percentage |  | 33.00% |  |  |
Service period (in years) |  | 3 years |  |  |
Vesting period |  | 3 years |  |  |
Restricted stock | Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares, Granted |  | 1,785 |  |  |
Performance-Based Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation cost related to stock awards |  | $ 1,400,000 | $ 1,400,000 |  |
Service period (in years) |  |  | 3 years |  |
Number of PRSUs awarded |  |  | 90,000 |  |
Performance-Based Restricted Stock Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of PRSUs awarded |  | 90,000 |  |  |
Directors' fees | Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost related to non-vested stock options |  | $ 440,000 |  |  |
Unrecognized compensation expense recognition period |  | 1 year |  |  |
Equity Incentive Plan 2019 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment award, shares authorized, maximum |  | 311,251 |  | 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] |  |  |  |  |
Share-based payment award, shares authorized, maximum |  |  | 341,562 |  |
Outstanding shares |  |  |  | 468,382 | 628,719
Non-vested stock compensation cost |  | $ 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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