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Leases (Tables)
 6 Months Ended
Mar. 31, 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:
Lease Assets and LiabilitiesClassificationMarch 31, 2025September 30, 2024
(in thousands)
Operating lease assetsRight-of-use assets$44,452 $45,255 
Current operating lease liabilitiesLease liabilities6,782 6,342 
Non-current operating lease liabilitiesLease liabilities, net of current portion107,529 111,027 
Three Months Ended March 31,Six Months Ended March 31,
Lease CostClassification2025202420252024
(in thousands)
Operating lease costResearch and development$2,709 $2,572 $5,520 $5,566 
General and administrative expense500 491 993 967 
Variable lease cost (1)
Research and development951 836 1,937 1,615 
General and administrative expense— — — — 
Total $4,160 $3,899 $8,450 $8,148 
(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 March 31, 2025:
YearAmounts
(in thousands)
2025 (remainder)$7,776 
202615,799 
202714,974 
202813,619 
202913,905 
2030 and thereafter114,790 
Total$180,863 
Less imputed interest$(66,552)
Total operating lease liabilities (includes current portion)$114,311 
Supplemental cash flow and other information related to leases was as follows:
Three Months Ended March 31,Six Months Ended March 31,
2025202420252024
(in thousands)
Cash received for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$— $— $— $3,099 
Right-of-use assets obtained in exchange for amended operating lease liabilities$— $— $— $64 
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$3,840 $2,046 $7,680 $4,016 
March 31,
20252024
Weighted-average remaining lease term (in years)12.113.0
Weighted-average discount rate8.0 %8.0 %