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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended 24 Months Ended
Sep. 30, 2020
Sep. 30, 2018
Dec. 31, 2019
Sep. 30, 2019
Income Tax Disclosure [Abstract]        
Statutory federal tax rate 21.00% 24.50%    
Tax Credit Carryforward [Line Items]        
Valuation allowance $ 17,449     $ 25,673
CARES Act NOLs   $ 13,000   20,300
Tax refund generated 4,200 $ 11,300 $ 11,300  
Tax receivables 7,145     $ 156
Tax Year 2039        
Tax Credit Carryforward [Line Items]        
Net operating losses 2,300      
United States federal        
Tax Credit Carryforward [Line Items]        
Net operating losses 18,900      
State        
Tax Credit Carryforward [Line Items]        
Net operating losses $ 48,400