Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Details)

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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Tax Credit Carryforward [Line Items]      
Valuation allowance $ 729    
Income tax rate 21.00% 24.30% 35.00%
Federal      
Tax Credit Carryforward [Line Items]      
Net operating loss carryforward $ 21,300    
Operating loss carryforward expiration date Dec. 31, 2030    
State      
Tax Credit Carryforward [Line Items]      
Net operating loss carryforward $ 11,300    
Operating loss carryforward expiration date Dec. 31, 2019