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Related Party (Details) - Firm - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
May 01, 2017
Related Party Transaction [Line Items]          
Legal fees $ 65 $ 67 $ 198 $ 201  
Firm Retainer          
Related Party Transaction [Line Items]          
Monthly retainer fee payable         $ 21