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STOCKHOLDERS' EQUITY - STOCK-BASED COMPENSATION TO SERVICE PROVIDERS (Details) - USD ($)
$ in Thousands
12 Months Ended
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