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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Income Tax Disclosure [Abstract]      
Income tax expense (benefit) $ 26 $ 84  
Income tax rate, percent 2.30% 1.80%  
Valuation allowance for deferred tax assets $ 17,400   $ 17,400
Tax refund 19   11,300
Income Taxes Receivable     $ 7,100
Refund 2,800    
Receivable, net $ 4,300