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Income Taxes - Net Operating Loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Taxes    
Valuation allowance $ 2,065 $ 8,930
Valuation allowance released 7,100  
Federal    
Income Taxes    
Net operating loss carryforwards available 2,800 10,700
State    
Income Taxes    
Net operating loss carryforwards available $ 136,900 $ 166,000