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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Bridge Warrants (Details) - Bridge Warrants - $ / shares
May 22, 2020
Jan. 28, 2020
Warrants    
Warrants exercise price (in dollars per share) $ 2.2362 $ 0.12
Term of warrants 5 years  
Number of shares of common stock subject to warrants (in shares) 413,751 187,944
Minimum    
Warrants    
Blocker provision percentage 4.99%  
Maximum    
Warrants    
Blocker provision percentage 9.99%