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Stockholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 06, 2020
Aug. 09, 2019
Mar. 28, 2019
Aug. 06, 2018
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jan. 22, 2018
Class of Stock [Line Items]                
Number of additional shares from warrants (in shares)         1,255,129   1,255,129  
Proceeds from the exercise of warrants         $ 6,900 $ 1,861 $ 17,542  
Preferred stock, shares authorized         2,000,000 2,000,000 2,000,000  
Preferred stock, par value (in dollars per share)         $ 0.001 $ 0.001 $ 0.001  
Number of rights issued per common stock (in shares)               1
Preferred stock issued during the period           $ 25,000 $ 10,000  
Dividends accrued         $ 400 $ 2,900 $ 400  
2018 Warrants                
Class of Stock [Line Items]                
Number of shares issued (in shares)       12,062,000        
Number of additional shares from warrants (in shares)       4,221,700        
Proceeds from sale of stock       $ 19,700        
Exercise price per share (in dollars per share)     $ 2.52 $ 2.52        
Proceeds from the exercise of warrants     $ 10,600          
2019 Warrants                
Class of Stock [Line Items]                
Number of additional shares from warrants (in shares)     2,500,000          
Exercise price per share (in dollars per share)     $ 7.00          
Series D Preferred Stock                
Class of Stock [Line Items]                
Exercise price per share (in dollars per share)               $ 10.00
Preferred stock, shares authorized           150,000    
Preferred stock, par value (in dollars per share)               $ 0.001
Number of preferred shares issued from exercise of right (in shares)               0.001
Series E preferred shares                
Class of Stock [Line Items]                
Number of shares issued (in shares) 25,000              
Preferred stock, shares authorized         10,000 39,500 10,000  
Preferred stock, par value (in dollars per share) $ 0.001       $ 0.001 $ 0.001 $ 0.001  
Purchase price (in dollars per share) $ 1,000              
Preferred stock issued during the period $ 25,000 $ 10,000            
Dividend rate   9.00%            
Redemption price   110.00%            
Liquidation preference per share (in dollars per share)   $ 1,000     $ 1,000 $ 1,000 $ 1,000  
Number of shares sold 25,000 10,000