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EQUITY INCENTIVE PLAN (Narrative) (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Jan. 01, 2019 | Jan. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  | $ 100,000 | $ 100,000 | $ 300,000 | $ 300,000 |
Unrecognized compensation expense related to unvested stock awards |  |  |  | 2,000,000 |  | $ 2,000,000 |  |
Unvested stock options, unrecognized compensation expense weighted average recognition period |  |  |  |  |  | 2 years 1 month 6 days |  |
Accrued expenses |  |  |  | $ 1,497,000 |  | $ 1,497,000 |  | $ 1,268,000
Stock Options [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock options, expected to vest, outstanding (in shares) |  |  |  | 662,910 |  | 662,910 |  |
Stock options, expected to vest, outstanding, aggregate intrinsic value |  |  |  | $ 0 |  | $ 0 |  |
Stock options, expected to vest remaining contractual term |  |  |  |  |  | 8 years 8 months 12 days |  |
Equity Incentive Plan 2017 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of additional shares authorized | 394,905 | 114,937 | 359,300 |  |  |  |  |
Maximum number of shares per employee |  |  | 66,666 |  |  |  |  |
Award plan, percentage of outstanding stock maximum |  |  | 5.00% |  |  |  |  |
Equity Incentive Plan 2017 [Member] | Stock Options [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Plan expiration date |  |  |  |  |  | Jun. 05, 2027 |  |
Number of shares authorized |  |  |  | 44,444 |  | 44,444 |  |

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