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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2017
Income Tax Disclosures [Line Items]      
Statutory tax rate     35.00%
Tax benefit from re-measurement of deferred tax assets and liabilities $ 3,700    
Scenario, Forecast      
Income Tax Disclosures [Line Items]      
Statutory tax rate   21.00%