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EQUITY INCENTIVE PLAN (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation | $ 0.4 | $ 0.2
Unvested stock options, unrecognized compensation expense weighted average recognition period | 2 years 2 months 12 days |
Unrecognized compensation expense related to unvested stock awards | $ 2.3 |
Stock Options [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (in shares) | 591,097 | 325,050
Granted (in dollars per share) | $ 2.16 | $ 2.09
Forfeited (in shares) | (55,993) | (13,267)
Forfeited (in dollars per share) | $ 2.25 | $ 5.43
Stock options, expected to vest, outstanding (in shares) | 1,133,868 |
Stock options, expected to vest, outstanding, aggregate intrinsic value | $ 0.2 |
Stock options, expected to vest remaining contractual term | 8 years 9 months 18 days |
Equity Incentive Plan 2017 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized | 1,792,431 |
Shares available for grant | 434,423 |
Percentage of annual increase in number of shares authorized for grant | 5.00% |
Number of additional shares authorized | 878,845 |
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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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