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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Securities Purchase Agreement (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
May 18, 2020
May 31, 2020
May 22, 2020
Jan. 28, 2020
Bridge Warrants        
Securities Purchase Agreement        
Number of shares of common stock subject to warrants (in shares)     413,751 187,944
Warrants exercise price (in dollars per share)     $ 2.2362 $ 0.12
Securities Purchase Agreement        
Securities Purchase Agreement        
Gross proceeds from sale of stock in private placement $ 25.0 $ 25.0    
Securities Purchase Agreement | Common units        
Securities Purchase Agreement        
Gross proceeds from sale of stock in private placement 20.0      
Securities Purchase Agreement | Senior secured notes        
Securities Purchase Agreement        
Gross proceeds from sale of stock in private placement $ 5.0      
Securities Purchase Agreement | Bridge Warrants        
Securities Purchase Agreement        
Number of shares of common stock subject to warrants (in shares)     413,751