Annual report pursuant to Section 13 and 15(d)

Stock Options, Warrants and Restricted Common Stock (Schedule of Stock-based Compensation) (Details)

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Stock Options, Warrants and Restricted Common Stock (Schedule of Stock-based Compensation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total stock-based compensation $ 3,407 $ 745
Restricted stock awards under Plan [Member]    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total stock-based compensation 3,407 687
Stock option awards under Plan [Member]    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Total stock-based compensation $ 58