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PREFERRED STOCK AND SHAREHOLDERS' EQUITY - Warrants Issued To Non-Employees (Details) - Share-based Payment Arrangement, Nonemployee [Member] - Warrants - $ / shares
1 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise price of warrants $ 3.3725    
Term of warrants 10 years    
Outstanding warrants   953,720 953,720
Vested warrants   574,844 574,844
Unvested warrants   378,876