Quarterly report pursuant to Section 13 or 15(d)

Warrants (Details)

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Warrants (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Feb. 28, 2023
Mar. 22, 2022
Mar. 22, 2022
Jan. 28, 2022
Sep. 13, 2021
Mar. 31, 2023
Dec. 31, 2022
Mar. 15, 2022
Class of Warrant or Right [Line Items]                
Number of securities called by warrants or rights (in shares)       657,402        
Warrants exercised (in shares)       184,153        
Assumptions, fair value of existing warrants per share (in usd per share)       $ 12.00        
Warrants forfeited (in shares)     394,000          
Warrants outstanding (in shares)               232,675
Preferred stock, shares authorized (in shares)           5,000,000 5,000,000  
Preferred stock, par value (in usd per share)           $ 0.001 $ 0.001  
Common shares issued for extinguishment of debt (in shares)           1,547,234    
Series 7 Convertible Preferred Stock                
Class of Warrant or Right [Line Items]                
Series 7 Preferred redeemed for cash (in shares)     49,250          
Preferred shares redeemed, cash consideration     $ 49.3          
Series 8 Convertible Preferred Stock                
Class of Warrant or Right [Line Items]                
Series 7 Preferred redeemed for cash (in shares)             53,197.72  
Preferred shares redeemed, cash consideration             $ 53.2  
Warrants forfeited (in shares)             751,841  
Preferred stock, shares authorized (in shares)   53,197.7234 53,197.7234          
Existing Warrants                
Class of Warrant or Right [Line Items]                
Number of securities called by warrants or rights (in shares)       52,513        
February 2023 Warrant Amendment                
Class of Warrant or Right [Line Items]                
Common stock issued in direct offering (in shares) 324,918              
Exercisable warrants per common share (in shares) 0.33              
September 2021 Warrants                
Class of Warrant or Right [Line Items]                
Common stock issued in direct offering (in shares) 76,794         324,918    
Common shares issued for extinguishment of debt (in shares) 232,675              
March 2022 Warrants                
Class of Warrant or Right [Line Items]                
Common stock issued in direct offering (in shares) 248,124         324,918    
Common shares issued for extinguishment of debt (in shares) 751,867              
Registered Direct Offering | Series 7 Convertible Preferred Stock                
Class of Warrant or Right [Line Items]                
Subscription price (in usd per share)         $ 920      
Original issuance discount percentage         8.00%      
Aggregate subscription value         $ 54.1      
Registered Direct Offering | Series 8 Convertible Preferred Stock                
Class of Warrant or Right [Line Items]                
Preferred stock, shares authorized (in shares)   53,197.7234 53,197.7234          
Preferred stock, par value (in usd per share)   $ 0.001 $ 0.001          
Number of shares sold under offering (in shares)   1,503,726            
Subscription price (in usd per share)   $ 940 $ 940          
Original issuance discount percentage   6.00% 6.00%          
Aggregate subscription value   $ 50.0 $ 50.0          
Registered Direct Offering | Pre-Funded Warrants                
Class of Warrant or Right [Line Items]                
Common stock issued in direct offering (in shares)           1,380,000    
Warrants | Series 7 Convertible Preferred Stock                
Class of Warrant or Right [Line Items]                
Percent of warrants forfeited upon redemption               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 | Registered Direct Offering                
Class of Warrant or Right [Line Items]                
Exercise price of warrants (in usd per share)           $ 0.001    
Warrants | Registered Direct Offering | Series 7 Convertible Preferred Stock                
Class of Warrant or Right [Line Items]                
Number of shares sold under offering (in shares)         626,667      
Warrants | Registered Direct Offering | Pre-Funded Warrants                
Class of Warrant or Right [Line Items]                
Warrants exercised for common shares (in shares)           1,380,000