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Income Taxes - Schedule of Components of Deferred Taxes (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]    
Net operating loss carryforwards $ 121,604 $ 113,402
Deferred credits 899 1,485
Other accrued expenses 2,682 2,842
Prepaids and other 1,969 1,632
Warrant liabilities 5,018  
State alternative minimum tax 1 1
Other reserves and estimated losses 729 641
Operating lease liabilities 15,226 24,263
Deferred revenue 1,439  
Gross deferred tax assets 149,567 144,266
Less: valuation allowance (2,922) (3,063)
Total net deferred tax assets 146,645 141,203
Intangible assets (1,552) (1,830)
Operating lease right-of-use assets (11,467) (19,210)
Property and equipment (200,105) (184,438)
Unrealized losses on equity investments (3,461)  
Total deferred tax liabilities (216,585) (205,478)
Net deferred tax liability $ (69,940) $ (64,275)