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STOCKHOLDERS' EQUITY - STOCK-BASED COMPENSATION TO SERVICE PROVIDERS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-Based Compensation to Service Providers |  |  |
Stock-based compensation for services by non-employees | $ 85 | $ 68 | $ 191
Consultants | Stock Options |  |  |
Stock-Based Compensation to Service Providers |  |  |
Stock-based compensation for services by non-employees | $ 56 | $ 24 | $ 50

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- Definition Fair value of share-based compensation granted to nonemployees as payment for services rendered or acknowledged claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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