Quarterly report pursuant to Section 13 or 15(d)

Warrants (Details)

v3.22.2.2
Warrants (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 22, 2022
Mar. 22, 2022
Jan. 28, 2022
Sep. 13, 2021
Feb. 16, 2021
Feb. 12, 2021
Feb. 11, 2021
Jan. 24, 2021
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2022
Class of Warrant or Right [Line Items]                      
Common stock, par value (in usd per share)                   $ 0.001 $ 0.001
Number of shares sold under offering (in shares)             3,000,000        
Number of securities called by warrants or rights (in shares)     49,305,088                
Warrants exercised (in shares)     13,811,407                
Assumptions, fair value of existing warrants per share (in usd per share)     $ 0.16                
Warrants forfeited (in shares)   29,550,000                  
Warrants outstanding (in shares) 17,450,000 17,450,000                  
Preferred stock, shares authorized (in shares)                   5,000,000 5,000,000
Preferred stock, par value (in usd per share)                   $ 0.001 $ 0.001
Series 7 Convertible Preferred Stock                      
Class of Warrant or Right [Line Items]                      
Mezzanine equity, convertible preferred shares, par value per share (in usd per share)       $ 0.001              
Series 7 Preferred redeemed for cash (in shares)   49,250                  
Series 7 Preferred redeemed for cash   $ 49.3             $ 49.3    
Series 8 Convertible Preferred Stock                      
Class of Warrant or Right [Line Items]                      
Number of shares sold under offering (in shares) 112,778,720                    
Subscription price (in usd per share) $ 940 $ 940                  
Original issuance discount percentage 6.00% 6.00%                  
Aggregate subscription value $ 50.0 $ 50.0                  
Preferred stock, shares authorized (in shares) 53,197.7234 53,197.7234                  
Preferred stock, par value (in usd per share) $ 0.001 $ 0.001                  
Purchase Warrants                      
Class of Warrant or Right [Line Items]                      
Exercisable warrants per common share (in shares)         1 1   1      
January 2021 Pre-Funded Warrants                      
Class of Warrant or Right [Line Items]                      
Exercisable warrants per common share (in shares)           1          
January 2021 Warrants                      
Class of Warrant or Right [Line Items]                      
Common stock issued in direct offering (in shares)                   13,554,838  
February 2021 Pre-Funded Warrants                      
Class of Warrant or Right [Line Items]                      
Common stock issued in direct offering (in shares)                   8,000,000  
Warrants to purchase shares of common stock (in shares)           8,000,000          
Offering price (in usd per share)           $ 1.999          
Exercisable warrants per common share (in shares)           1          
Second February 2021 Pre-Funded Warrants                      
Class of Warrant or Right [Line Items]                      
Common stock issued in direct offering (in shares)                   6,950,250  
Warrants to purchase shares of common stock (in shares)         6,950,250            
Offering price (in usd per share)         $ 2.009            
Exercisable warrants per common share (in shares)         1            
Existing Warrants                      
Class of Warrant or Right [Line Items]                      
Number of securities called by warrants or rights (in shares)     3,938,424                
Registered Direct Offering                      
Class of Warrant or Right [Line Items]                      
Common stock issued in direct offering (in shares)         3,000,000 7,000,000   5,800,000      
Subscription price (in usd per share)       $ 920              
Original issuance discount percentage       8.00%              
Aggregate subscription value       $ 54.1              
Registered Direct Offering | Series 7 Convertible Preferred Stock                      
Class of Warrant or Right [Line Items]                      
Number of shares sold under offering (in shares)       58,750              
Subscription price (in usd per share)       $ 920              
Original issuance discount percentage       8.00%              
Aggregate subscription value       $ 54.1              
Registered Direct Offering | Common Stock                      
Class of Warrant or Right [Line Items]                      
Number of shares sold under offering (in shares)       47,000,000              
Registered Direct Offering | January 2021 Pre-Funded Warrants                      
Class of Warrant or Right [Line Items]                      
Warrants to purchase shares of common stock (in shares)               3,000,000      
Offering price (in usd per share)               $ 1.549      
Exercisable warrants per common share (in shares)               1      
Warrants                      
Class of Warrant or Right [Line Items]                      
Warrants to purchase shares of common stock (in shares)         9,950,250 15,000,000   19,354,838      
Exercise price of warrants (in usd per share)                   $ 0.001  
Percent of warrants forfeited upon redemption       75.00%              
Warrants | Series 7 Convertible Preferred Stock                      
Class of Warrant or Right [Line Items]                      
Percent of warrants forfeited upon redemption 75.00% 75.00%                  
Warrants | Series 8 Convertible Preferred Stock                      
Class of Warrant or Right [Line Items]                      
Percent of warrants forfeited upon redemption 50.00% 50.00%                  
Warrants | Purchase Warrants                      
Class of Warrant or Right [Line Items]                      
Offering price (in usd per share)         $ 2.01 $ 2.00   $ 1.55      
Exercise price of warrants (in usd per share)         $ 2.01 $ 2.00   $ 1.55      
Warrants | January 2021 Warrants                      
Class of Warrant or Right [Line Items]                      
Warrants exercised for common shares (in shares)                   13,554,838  
Warrants | February 2021 Pre-Funded Warrants                      
Class of Warrant or Right [Line Items]                      
Warrants exercised for common shares (in shares)                   8,000,000  
Warrants | Second February 2021 Pre-Funded Warrants                      
Class of Warrant or Right [Line Items]                      
Warrants exercised for common shares (in shares)                   6,950,250  
Warrants | Registered Direct Offering                      
Class of Warrant or Right [Line Items]                      
Common stock issued in direct offering (in shares)         3,000,000 7,000,000   5,800,000      
Common stock, par value (in usd per share)           $ 0.001   $ 0.001      
Number of shares sold under offering (in shares)       47,000,000              
Warrants | Registered Direct Offering | Series 7 Convertible Preferred Stock                      
Class of Warrant or Right [Line Items]                      
Number of shares sold under offering (in shares)       47,000,000              
Warrants | Registered Direct Offering | Purchase Warrants                      
Class of Warrant or Right [Line Items]                      
Warrant and rights outstanding, term         5 years 5 years   5 years      
Warrants | Registered Direct Offering | January 2021 Pre-Funded Warrants                      
Class of Warrant or Right [Line Items]                      
Exercise price of warrants (in usd per share)         $ 0.001 $ 0.001   $ 0.001