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Litigation Funding Agreement (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Litigation Funding Agreement [Abstract]          
Legal expenses attributable to the Litigation Funding Agreement   $ 1,169 $ 0 $ 1,169 $ 0
R. A. Bianco [Member]          
Litigation Fund [Line Items]          
Litigation fund   $ 7,000   $ 7,000  
R. A. Bianco [Member] | Minimum [Member]          
Litigation Fund [Line Items]          
Percentage of recovery sharing ratio       30.00%  
R. A. Bianco [Member] | Maximum [Member]          
Litigation Fund [Line Items]          
Percentage of recovery sharing ratio       45.00%  
R. A. Bianco [Member] | Subsequent Event [Member]          
Litigation Funding Agreement [Abstract]          
Additional amount funded for legal expenses $ 700