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STOCK-BASED COMPENSATION - Stock-based compensation expenses (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
STOCK-BASED COMPENSATION |  |
Stock compensation in continuing operations | $ 79,000 | $ 372,000
Stock compensation in discontinued operations |  | 288,000
Total stock compensation expenses | 79,000 | 660,000
Research and development |  |
STOCK-BASED COMPENSATION |  |
Stock compensation in continuing operations | 6,000 | 151,000
General and administrative |  |
STOCK-BASED COMPENSATION |  |
Stock compensation in continuing operations | $ 73,000 | $ 221,000

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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