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Related Party Arrangements (Details Textual) - Chief Executive Officer - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accrued Expenses and Other Liabilities    
Related Party Transaction [Line Items]    
Unpaid expense   $ 111
Research Grants    
Related Party Transaction [Line Items]    
Total expense $ 286 $ 325