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EQUITY INCENTIVE PLAN (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 18, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation |  | $ 0.4 | $ 0.1 | $ 0.8 | $ 0.3
Unvested stock options, unrecognized compensation expense weighted average recognition period |  |  |  | 2 years 6 months |
Unrecognized compensation expense related to unvested stock awards |  | $ 1.9 |  | $ 1.9 |
Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted (in shares) |  |  |  | 597,347 | 325,050
Granted (in dollars per share) |  |  |  | $ 2.17 | $ 2.13
Forfeited (in shares) |  |  |  | (58,341) | (24,147)
Forfeited (in dollars per share) |  |  |  | $ 3.02 | $ 5.04
Stock options, expected to vest, outstanding (in shares) |  | 1,121,725 |  | 1,121,725 |
Stock options, expected to vest, outstanding, aggregate intrinsic value |  | $ 1.4 |  | $ 1.4 |
Stock options, expected to vest remaining contractual term |  |  |  | 8 years 6 months |
Equity Incentive Plan 2017 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized |  | 2,717,431 |  | 2,717,431 |
Shares available for grant |  | 1,355,514 |  | 1,355,514 |
Percentage of annual increase in number of shares authorized for grant |  |  |  | 5.00% |
Number of additional shares authorized | 925,000 |  |  | 1,803,845 |
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 |

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