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WARRANTS - Warrants Issued To Non-Employees (Details) - $ / shares
1 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price of warrants       $ 11.50
Outstanding warrants       25,158,086
Non-employee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price of warrants $ 1.79      
Term of warrants 10 years      
Outstanding warrants   1,792,944 1,792,944  
Vested warrants   1,080,707 1,080,707