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, 2021
Jan. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Equity Offering          
Common Stock shares, Outstanding     9,864,068   7,139,068
Finance costs attributable to issuance of warrants     $ 0 $ 211  
2015 Plan          
Equity Offering          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 1,000,000        
January 2020 Offering          
Equity Offering          
Issuance of common stock, net (in shares)   290,000      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   290,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 7.50      
Proceeds from sale of common stock   $ 1,900      
Finance costs attributable to issuance of warrants     $ 200    
January 2021 Offering          
Equity Offering          
Issuance of common stock, net (in shares) 2,725,000        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 2,725,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 3.55        
Proceeds from sale of common stock $ 8,900