Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jan. 31, 2020
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Equity Offering            
Common Stock shares, Outstanding 116,763,180   116,763,180 116,763,180   57,378,794
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 31,244,386   31,244,386 31,244,386    
Net proceeds from the exercises of common stock warrants       $ 7,030 $ 724  
Finance costs attributable to issuance of warrants       $ 211 $ 0  
January 2020 Offering            
Equity Offering            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   8,700,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.25        
Issuance of common stock, net (in shares)   8,700,000        
Proceeds from sale of common stock   $ 1,900        
Finance costs attributable to issuance of warrants     $ 211      
September 2020 Offering            
Equity Offering            
Issuance of common stock, net (in shares) 19,440,000          
Share issue price (in dollars per share) $ 0.14   $ 0.14 $ 0.14    
Proceeds from sale of common stock $ 2,400