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Leases
 12 Months Ended
Sep. 30, 2025
Leases [Abstract]  
Leases LEASES
Pasadena, California: The Company leases 49,000 square feet of office space located at 177 East Colorado Blvd. for its corporate headquarters from 177 Colorado Owner, LLC, which lease expires on April 30, 2027. The lease contains an option to renew for one additional five-year term. The Company is not reasonably certain that it will exercise this option to renew and therefore it is not included in right-of-use assets and liabilities as of September 30, 2025.
San Diego, California: The Company leases 144,000 square feet of office and research and development laboratory space located at 10102 Hoyt Park from 11404 & 11408 Sorrento Valley Owner, LLC, which lease expires on April 30, 2038. Pursuant to the lease, within twelve months of the expiration of the initial 15-year term, the Company has the option to extend the lease for up to one additional ten-year term, with certain annual increases in base rent. The Company is not reasonably certain that it will exercise this option to renew and therefore it is not included in right-of-use assets and liabilities as of September 30, 2025.
The lease agreement, as amended, granted the Company the right to receive an Additional Tenant Improvement Allowance (“ATIA”) funded by the lessor. The Company received $30.8 million in ATIA, including a final payment of $3.1 million during the first quarter of fiscal 2024. As a result, the Company remeasured its lease liability and right-of-use assets to reflect these additional allowances and the related increased lease payments. The Company has further concluded that these ATIAs have no effects on the classification of the lease.
Madison, Wisconsin: The Company leases 110,956 square feet space, which it increased from 107,000 square feet on June 30, 2025, located at 502 South Rosa Road for its office and laboratory facilities, which lease expires on September 30, 2031. The lease contains options to renew for two terms of five years. The Company is not reasonably certain that it will exercise this option and therefore it is not included in right-of-use assets and liabilities as of September 30, 2025.
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 LiabilitiesClassification20252024
(in thousands)
Operating lease assetsRight-of-use assets$43,891 $45,255 
Current operating lease liabilitiesLease liabilities7,289 6,342 
Non-current operating lease liabilitiesLease liabilities, net of current portion104,112 111,027 
Year Ended September 30,
Lease CostClassification202520242023
(in thousands)
Operating lease costResearch and development$10,483 $11,035 $10,350 
General and administrative expense1,952 2,006 1,730 
Variable lease cost(1)
Research and development4,076 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.
There was $0, $0 and $1.4 million in short-term lease cost during the years ended September 30, 2025, 2024, and 2023, respectively.

The following table presents maturities of operating lease liabilities on an undiscounted basis as of September 30, 2025:
YearAmounts
(in thousands)
2026$15,873 
202715,050 
202813,696 
202913,985 
203014,282 
2031 and thereafter100,672 
Total$173,558 
Less imputed interest(62,157)
Total operating lease liabilities$111,401 
Supplemental cash flow and other information related to leases was as follows:
Year Ended September 30,
202520242023
(in thousands)
Cash received for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$— $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)11.7012.513.5
Weighted-average discount rate8.0 %8.0 %8.0 %