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Leases (Tables) | 12 Months Ended
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Sep. 30, 2025
Leases [Abstract] |
Schedule of Lease Assets and Liabilities and Lease Cost | The components of lease assets and liabilities along with their classification on the Company’s consolidated balance sheets were as follows:
|  |  | September 30,
Lease Assets and Liabilities | Classification |  | 2025 |  | 2024
|  |  | (in thousands)
Operating lease assets | Right-of-use assets |  | $ | 43,891 |  |  | $ | 45,255 |
Current operating lease liabilities | Lease liabilities |  | 7,289 |  |  | 6,342 |
Non-current operating lease liabilities | Lease liabilities, net of current portion |  | 104,112 |  |  | 111,027 |
|  |  | Year Ended September 30,
Lease Cost | Classification |  | 2025 |  | 2024 |  | 2023
|  |  | (in thousands)
Operating lease cost | Research and development |  | $ | 10,483 |  |  | $ | 11,035 |  |  | $ | 10,350 |
| General and administrative expense |  | 1,952 |  |  | 2,006 |  |  | 1,730 |
Variable lease cost(1) | Research and development |  | 4,076 |  |  | 3,648 |  |  | 1,179 |
| General and administrative expense |  | — |  |  | — |  |  | — |
Total |  |  | $ | 16,511 |  |  | $ | 16,689 |  |  | $ | 13,259 |
(1) Variable lease cost is primarily related to operating expenses associated with the Company’s operating leases.
Schedule of Maturities of Operating Lease Liabilities on an Undiscounted Basis | The following table presents maturities of operating lease liabilities on an undiscounted basis as of September 30, 2025:
Year | Amounts
| (in thousands)
2026 | $ | 15,873 |
2027 | 15,050 |
2028 | 13,696 |
2029 | 13,985 |
2030 | 14,282 |
2031 and thereafter | 100,672 |
Total | $ | 173,558 |
Less imputed interest | (62,157) |
Total operating lease liabilities | $ | 111,401 |
Supplemental cash flow and other information related to leases was as follows:
|  | Year Ended September 30,
|  | 2025 |  | 2024 |  | 2023
|  | (in thousands)
Cash received for amounts included in the measurement of lease liabilities: |  |  |  |  |  |
Operating cash flows from operating leases |  | $ | — |  |  | $ | 3,099 |  |  | $ | 48,391 |
Right-of-use assets adjusted in exchange for new/amended operating lease liabilities |  | $ | — |  |  | $ | (29) |  |  | $ | 17,071 |
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |
Operating cash flows from operating leases |  | $ | 15,474 |  |  | $ | 11,038 |  |  | $ | 5,204 |
Weighted-average remaining lease term (in years) |  | 11.70 |  | 12.5 |  | 13.5
Weighted-average discount rate |  | 8.0 | % |  | 8.0 | % |  | 8.0 | %

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
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