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Preferred Stock (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 13, 2021
Feb. 16, 2021
Feb. 11, 2021
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Class of Stock [Line Items]              
Number of shares sold under offering (in shares)   15,800,000 3,000,000        
Net proceeds from issuance of preferred stock and warrants $ 50,600,000       $ 50,584,000 $ 0  
Registered Direct Offering              
Class of Stock [Line Items]              
Subscription price (in usd per share) $ 920            
Original issuance discount percentage 8.00%            
Aggregate subscription value $ 54,050,000            
Registered Direct Offering | Warrants              
Class of Stock [Line Items]              
Number of shares sold under offering (in shares) 47,000,000            
Series 7 Convertible Preferred Stock              
Class of Stock [Line Items]              
Mezzanine equity, convertible preferred stock, shares authorized (in shares) 58,750     58,750 58,750   58,750
Mezzanine equity, convertible preferred shares, par value per share (in usd per share) $ 0.001            
Mezzanine equity, convertible preferred shares, maximum voting power percentage 19.99%            
Mezzanine equity, convertible preferred shares, stated value per share (in usd per share) $ 1,000            
Mezzanine equity, convertible preferred shares, conversion price (in usd per share) $ 1.25            
Common shares issued for conversion of preferred shares (in shares)       9,500      
Mezzanine equity, convertible preferred stock, shares outstanding (in shares)       49,250 49,250   0
Series 7 Convertible Preferred Stock | Registered Direct Offering              
Class of Stock [Line Items]              
Number of shares sold under offering (in shares) 58,750