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BUSINESS DESCRIPTION (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 08, 2023 | Apr. 14, 2023 | Mar. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2024 | Jan. 19, 2024 | Apr. 13, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  | $ 5,800,000 |  |  |  |
Net cash used in operating activities |  |  |  |  | (3,559,000) | $ (7,721,000) |  |  |
Accumulated deficit |  |  |  |  | (98,150,000) | (92,297,000) |  |  |
Working capital |  |  |  |  | 500,000 |  |  |  |
Proceeds from issuance of common stock |  |  |  |  | 2,245,000 | 129,000 |  |  |
Gain on dissolution of the joint venture |  |  |  |  | $ 100,000 |  |  |  |
Reverse stock split description |  |  |  |  | On September 21, 2023 we filed a Certificate of Amendment to our Third Amended and Restated Certificate of Incorporation with the Secretary of State of Delaware, pursuant to which we effected a 1-for-20 reverse stock split (the “Reverse Stock Split”) of our issued and outstanding common stock. The Reverse Stock Split became effective as of 5:00 p.m. (Eastern Time) on September 21, 2023, and our common stock began trading on a split-adjusted basis on the Nasdaq Capital Market at the market open on September 22, 2023. Unless otherwise indicated, all share amounts, per share data, share prices, exercise prices and conversion rates set forth in these notes and the accompanying consolidated financial statements have, where applicable, been adjusted retroactively to reflect this reverse stock split |  |  |  |
Subsequent Events [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate authorized offering price |  |  |  |  |  |  |  | $ 865,889 |
Amount available for future sale of shares pursuant to the sales agreement |  |  |  |  |  |  |  | 800,000 |
AGP 2023 Sales Agreement |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate authorized offering price |  | $ 5,800,000 |  |  |  |  |  |  |
Proceeds from issuance of common stock |  | $ 100,000 |  |  | $ 1,000 |  |  |  |
Shares issued (in shares) |  | 10,192 |  |  | 25 |  |  |  |
Amount available for future sale of shares pursuant to the sales agreement |  |  |  |  | $ 3,700,000 |  |  |  |
AGP 2023 Sales Agreement | Subsequent Events [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate authorized offering price |  |  |  |  |  |  |  | 865,889 |
Amount available for future sale of shares pursuant to the sales agreement |  |  |  |  |  |  |  | $ 800,000 |
AGP 2023 Sales Agreement | AGP |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  | 10,167 | 10,189 |  |  |  |  |
Payments of stock issuance costs |  |  |  | $ 2,000 |  |  |  |  |
Securities purchase agreement |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ 2,000,000.0 |  |  |  |  |  |  |  |
Shares issued (in shares) | 206,250 |  |  |  |  |  |  |  |
Payments of stock issuance costs | $ 200,000 |  |  |  |  |  |  |  |
At The Market Offering Agreement | AGP |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate authorized offering price |  |  |  |  |  |  |  |  | $ 50,000,000.0
Proceeds from issuance of common stock |  |  |  |  | $ 500,000 | $ 100,000 | $ 15,600,000 |  |
Shares issued (in shares) |  |  |  |  | 30,827 | 4,251 | 260,128 |  |
Payments of stock issuance costs |  |  |  |  |  |  | $ 500,000 |  |
Maximum | AGP 2023 Sales Agreement |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate authorized offering price |  | $ 5,800,000 |  |  |  |  |  |  |
Maximum | AGP 2023 Sales Agreement | AGP |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 100,000 | $ 100,000 |  |  |  |  |

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