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Income Taxes (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Income Tax Contingency [Line Items]      
Effective tax rate, percent 21.00% (14.00%)  
Income tax benefit $ 718,000    
Tax benefit due to the Tax Cuts and Jobs Act 198    
Transition tax expense recorded 0    
Valuation allowance released on deferred tax assets $ 305,000    
Forecast      
Income Tax Contingency [Line Items]      
Blended statutory rate for fiscal year 2018     24.50%