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Income Taxes - Schedule of Components of Deferred Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023
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Income Tax Disclosure [Abstract] |  |  |
Net operating loss carryforwards | $ 80,898 | $ 114,366 | $ 125,306
Deferred credits | 466 | 695 | 1,057
Other accrued expenses | 1,316 | 1,562 | 1,234
Prepaids and other | 328 | 252 | 556
Warrant liabilities | 5,737 | 5,767 | 5,748
Other reserves and estimated losses | 1,008 | 1,090 | 937
Operating lease liabilities | 1,887 | 2,306 | 2,991
Deferred revenue | 3,500 | 2,217 | 4,829
Interest expense carryforward | 18,176 | 9,257 | 6,457
Unrealized gain on equity investments | 107 | 99 |
Gross deferred tax assets | 113,423 | 137,611 | 149,115
Less: valuation allowance | (62,465) | (41,648) | (21,102)
Total net deferred tax assets | 50,958 | 95,963 | 128,013
Operating lease right-of-use assets | (1,507) | (1,883) | (2,475)
Property and equipment | (52,388) | (102,253) | (131,805)
Unrealized loss on equity investments |  |  | (2,147)
Total deferred tax liabilities | (53,895) | (104,136) | (136,427)
Net deferred tax liabilities | $ (2,937) | $ (8,173) | $ (8,414)

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