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 6 Months Ended
Jan. 31, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Equity Offering          
Common Stock shares, Outstanding   97,223,180 97,223,180   57,378,794
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   31,144,386 31,144,386    
Proceeds from Issuance of Common Stock     $ 0 $ 466  
Net proceeds from the exercises of common stock warrants     7,008 710  
Finance costs attributable to issuance of warrants     $ 211 $ 0  
January 2020 Offering          
Equity Offering          
Stock Issued During Period, Shares, New Issues 8,700,000        
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        
Proceeds from Issuance of Common Stock $ 1,900        
Finance costs attributable to issuance of warrants   $ 211,000