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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2025
Income Tax Disclosure [Abstract] |
Schedule of Components of Income (Loss) Before Income Tax Expense and Noncontrolling Interest | The components of the income (loss) before income tax expense and noncontrolling interest are as follows:
| Year Ended September 30,
| 2025 |  | 2024 |  | 2023
| (in thousands)
Domestic | $ | (42,573) |  |  | $ | (582,333) |  |  | $ | (194,639) |
Foreign | 94,106 |  |  | (30,127) |  |  | (7,852) |
Total | $ | 51,533 |  |  | $ | (612,460) |  |  | $ | (202,491) |
Schedule of Income Taxes for Provisions (Benefit) | Income tax provision (benefit) consisted of the following components:
| Year Ended September 30,
| 2025 |  | 2024 |  | 2023
| (in thousands)
Current: |  |  |  |  |
Federal | $ | 21,440 |  |  | $ | 148 |  |  | $ | 1,074 |
State | (56) |  |  | 375 |  |  | 1,710 |
Foreign | 35 |  |  | (3,290) |  |  | — |
Total current tax | $ | 21,419 |  |  | $ | (2,767) |  |  | $ | 2,784 |
Deferred: |  |  |  |  |
Federal | $ | — |  |  | $ | — |  |  | $ | — |
State | — |  |  | — |  |  | — |
Foreign | — |  |  | — |  |  | — |
Total deferred tax | $ | — |  |  | $ | — |  |  | $ | — |
Income tax provision | $ | 21,419 |  |  | $ | (2,767) |  |  | $ | 2,784 |
Schedule of Effective Income Tax Rate Reconciliation | The following table presents a reconciliation of the tax expense based on the statutory rate to the Company’s actual tax expense in the consolidated statements of operations and comprehensive income (loss). A notional 21% tax rate was applied as follows:
| September 30,
| 2025 |  | 2024 |  | 2023
U.S. federal statutory income tax | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State income taxes, net of federal tax benefit | (3.1) | % |  | 2.6 | % |  | 0.4 | %
Tax credits | (44.4) | % |  | 3.0 | % |  | 6.8 | %
Permanent and other items | (37.9) | % |  | 2.5 | % |  | (4.6) | %
Non-deductible compensation | 5.1 | % |  | (0.9) | % |  | (4.6) | %
Foreign-derived intangible income deduction | (16.2) | % |  | — | % |  | 1.2 | %
Other income | 11.1 | % |  | — | % |  | — | %
Stock compensation | 10.7 | % |  | (0.7) | % |  | (1.1) | %
Valuation allowance | 95.4 | % |  | (27.0) | % |  | (20.5) | %
Effective income tax rate | 41.7 | % |  | 0.5 | % |  | (1.4) | %
Schedule of Components of the Net Deferred Tax Assets and Liabilities | The following table presents the significant components of the Company’s net deferred tax assets and liabilities:
| September 30, |
| 2025 |  | 2024 |
| (in thousands) |
Deferred tax assets: |  |  |  |
Net operating loss carryforwards | $ | 70,858 |  |  | $ | 102,716 |  |
Capitalized research and development | 232,360 |  |  | 156,015 |  |
Tax credits | 48,867 |  |  | 85,428 |  |
Deferred revenue | 171,262 |  |  | 81,556 |  |
Lease liabilities | 23,919 |  |  | 27,999 |  |
Stock compensation | 9,184 |  |  | 10,989 |  |
Accrued compensation | 4,254 |  |  | 4,078 |  |
Intangible assets | 1,034 |  |  | 1,384 |  |
Other | 948 |  |  | 2,843 |  |
Total gross deferred tax assets | $ | 562,686 |  |  | $ | 473,008 |  |
Valuation allowance | $ | (497,543) |  |  | $ | (448,867) |  |
Deferred tax liabilities: |  |  |  |
Fixed assets | $ | (30,503) |  |  | $ | (13,155) |  |
Right-of-use assets | (9,424) |  |  | (10,792) |  |
Unrealized gains | (630) |  |  | (194) |  |
Original Issue Discount | (24,586) |  |  | — |  |
Total gross deferred tax liability | $ | (65,143) |  |  | $ | (24,141) |  |
Net deferred tax assets (liabilities) | $ | — |  |  | $ | — |  |
Schedule of Gross Unrecognized Tax Benefits | The following table summarizes the Company’s gross unrecognized tax benefits:
| Year Ended September 30,
| 2025 |  | 2024 |  | 2023
| (in thousands)
Beginning balance of unrecognized tax benefits | $ | 16,613 |  |  | $ | 14,536 |  |  | $ | 3,481 |
Gross increase for prior period tax positions | 1,160 |  |  | 654 |  |  | 9,495 |
Gross decrease for prior period tax positions | — |  |  | — |  |  | (1,489) |
Gross increase for current period tax positions | 4,379 |  |  | 3,415 |  |  | 3,049 |
Lapse of statue of limitations | — |  |  | (1,992) |  |  | — |
Ending balance of unrecognized tax benefits | $ | 22,152 |  |  | $ | 16,613 |  |  | $ | 14,536 |

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