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Convertible Preferred Stock - Schedule of Preferred Stock at Balance Sheet (Details) - USD ($)
Jun. 30, 2021
Apr. 30, 2021
Dec. 31, 2020
Nov. 30, 2020
Jul. 31, 2020
Preferred stock, shares authorized (in shares) 16,944,484   12,647,934    
Preferred stock, shares issued (in shares) 16,944,484   12,647,934    
Preferred stock, shares outstanding (in shares) 16,944,484   12,647,934    
Carrying Value $ 504,711,000   $ 169,548,000    
Preferred stock, liquidation preference value $ 505,399,000   $ 169,900,000    
Common Stock Issuable Upon Conversion 84,722,420   63,239,670    
Series A Preferred Stock [Member]          
Preferred stock, shares authorized (in shares) 11,237,500   11,237,500    
Preferred stock, shares issued (in shares) 11,237,500   11,237,500   6,237,500
Preferred stock, shares outstanding (in shares) 11,237,500   11,237,500    
Carrying Value $ 89,706,000   $ 89,706,000    
Preferred stock, liquidation preference value $ 89,900,000   $ 89,900,000    
Common Stock Issuable Upon Conversion 56,187,500   56,187,500    
Series B Preferred Stock [Member]          
Preferred stock, shares authorized (in shares) 1,410,434   1,410,434    
Preferred stock, shares issued (in shares) 1,410,434   1,410,434 1,410,434  
Preferred stock, shares outstanding (in shares) 1,410,434   1,410,434    
Carrying Value $ 79,842,000   $ 79,842,000    
Preferred stock, liquidation preference value $ 80,000,000   $ 80,000,000    
Common Stock Issuable Upon Conversion 7,052,170   7,052,170    
Series C Preferred Stock [Member]          
Preferred stock, shares authorized (in shares) 4,296,550 4,296,550      
Preferred stock, shares issued (in shares) 4,296,550 4,296,550      
Preferred stock, shares outstanding (in shares) 4,296,550        
Carrying Value $ 335,163,000        
Preferred stock, liquidation preference value $ 335,499,000        
Common Stock Issuable Upon Conversion 21,482,750