Quarterly report pursuant to Section 13 or 15(d)

Preferred Stock (Details)

v3.22.1
Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Sep. 13, 2021
Feb. 11, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Jan. 14, 2019
Apr. 20, 2018
Class of Stock [Line Items]              
Number of shares sold under offering (in shares)   3,000,000          
Net proceeds from issuance of preferred stock and warrants $ 50,600   $ 46,906 $ 0      
Preferred stock, shares authorized (in shares)     5,000,000   5,000,000    
Preferred stock, par value (in usd per share)     $ 0.001   $ 0.001    
Preferred stock, shares outstanding (in shares)     49,250        
Common Stock              
Class of Stock [Line Items]              
Common shares issued for conversion of preferred shares (in shares)     7,600,000        
Registered Direct Offering              
Class of Stock [Line Items]              
Subscription price (in usd per share) $ 920            
Original issuance discount percentage 8.00%            
Aggregate subscription value $ 54,100            
Registered Direct Offering | Warrants              
Class of Stock [Line Items]              
Number of shares sold under offering (in shares) 47,000,000            
Series 4 Convertible Preferred Stock              
Class of Stock [Line Items]              
Preferred stock, shares authorized (in shares)     10,415   10,415   10,415
Preferred stock, par value (in usd per share)             $ 1,000
Series preferred stock conversion value (in shares)             $ 828
Preferred stock, shares outstanding (in shares)     1   1    
Series 5 Convertible Preferred Stock              
Class of Stock [Line Items]              
Preferred stock, shares authorized (in shares)     12,000   12,000 12,000  
Preferred stock, par value (in usd per share)           $ 1,000  
Series preferred stock conversion value (in shares)           $ 149.85  
Preferred stock, shares outstanding (in shares)     126   126    
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    
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            
Net proceeds from issuance of preferred stock and warrants $ 50,600            
Common shares issued for conversion of preferred shares (in shares)     9,500        
Mezzanine equity, convertible preferred stock, shares outstanding (in shares)     0   49,250    
Series 7 Preferred redeemed for cash (in shares)     49,250        
Series 7 Preferred redeemed for cash     $ 49,300        
Series 7 Convertible Preferred Stock | Registered Direct Offering              
Class of Stock [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 $ 54,100            
Series 8 Convertible Preferred Stock              
Class of Stock [Line Items]              
Mezzanine equity, convertible preferred stock, shares authorized (in shares)     53,197.7234   53,197.7234    
Number of shares sold under offering (in shares)     112,778,720        
Subscription price (in usd per share)     $ 940        
Original issuance discount percentage     6.00%        
Aggregate subscription value     $ 50,000        
Net proceeds from issuance of preferred stock and warrants     $ 46,900        
Mezzanine equity, convertible preferred stock, shares outstanding (in shares)     53,197.7234   0    
Preferred stock, shares authorized (in shares)     53,197.7234        
Preferred stock, par value (in usd per share)     $ 0.001        
Preferred stock, stated value per share (in usd per share)     $ 1,000        
Maximum voting power per holder     19.99%        
Preferred stock, convertible, conversion price (in dollars per share)     $ 0.4717