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
Jan. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Equity Offering      
Common Stock shares, Outstanding   93,467,258 57,378,794
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   27,388,464  
Proceeds from Issuance of Common Stock   $ 1,895 $ 0
Net proceeds from the exercises of common stock warrants   6,162 605
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