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Income Taxes - Additional Information (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Income tax examination, likelihood of unfavorable settlement greater than 50 percent    
Uncertain tax positions $ 0   $ 0
Accrued interest or penalties 0   0
Recognized interest or penalties 0 $ 0  
Income taxes paid other than state minimum taxes $ 0   $ 0