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, 2021
Jan. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Equity Offering              
Common Stock shares, Outstanding     9,864,068   9,864,068   7,139,068
Finance costs attributable to issuance of warrants         $ 0 $ 211  
Non-cash loss on changes in fair value of warrants     $ 0 $ 0 0 $ 923  
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    
Non-cash loss on changes in fair value of warrants   $ 900          
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 $ 8,800