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Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 6 Months Ended 54 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]          
Cash and cash equivalents $ 2,106 $ 2,352 $ 2,106 $ 4,064 $ 11,211
Working capital 13,765   13,765    
Net cash used in operating activities 113 $ (1,398)      
Increase of cash used in operating activities $ 1,511        
Litigation for Intellectual Property Infringement [Member]          
Loss Contingencies [Line Items]          
Litigation settlement expense     $ 17,383