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Deferred Tax Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019
Deferred tax assets |  |
Investment in partnership | $ 14,443 | $ 40,880
Stock-based compensation | 186 | 811
Tax receivable agreement | 193 | 0
Deferred revenue | 571 | 564
Accrued expenses | 29 | 110
Net operating loss carryforwards | 1,775 | 6,360
Section 163j carryforward | 0 | 2,006
Other | 33 | 42
Gross deferred tax assets | 17,230 | 50,773
Valuation Allowance | (15,517) | (16,609)
Deferred tax liabilities |  |
Intangible assets | (1,656) | (6,257)
Other | (5) | (285)
Net deferred tax asset | 52 | $ 27,622
Decrease to Investment in Partnership |  |
Valuation Allowance [Line Items] |  |
Immaterial adjustment to prior year amount | 7,515 |
Decrease to Valuation Allowance |  |
Valuation Allowance [Line Items] |  |
Immaterial adjustment to prior year amount | 7,515 |
Increase to Net Operating Loss Carryforwards |  |
Valuation Allowance [Line Items] |  |
Immaterial adjustment to prior year amount | 1,672 |
Increase to Valuation Allowance |  |
Valuation Allowance [Line Items] |  |
Immaterial adjustment to prior year amount | $ 1,672 |

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