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STOCKHOLDERS' EQUITY - COMMON STOCK RESERVED FOR FUTURE ISSUANCE (Details) - shares
Dec. 31, 2021
Dec. 31, 2020
STOCKHOLDERS' EQUITY    
Stock options outstanding (in shares) 49,952,409 43,663,691
Stock options and awards available for grant (in shares) 18,763,393 7,257,747
Warrants outstanding (in shares) 64,108,705  
Common stock reserved for future issuance (in shares) 133,292,810  
Employee stock purchase    
STOCKHOLDERS' EQUITY    
Common stock reserved for future issuance (in shares) 468,303