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Leases (Tables)
 6 Months Ended
Mar. 31, 2024
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, 2024September 30, 2023
(in thousands)
Operating lease assetsRight-of-use assets$44,626 $45,297 
Current operating lease liabilitiesLease liabilities5,285 10,563 
Non-current operating lease liabilitiesLease liabilities, net of current portion113,632 104,608 
Three Months Ended March 31,Six Months Ended March 31,
Lease CostClassification2024202320242023
(in thousands)
Operating lease costResearch and development$2,572 $2,343 $5,566 $4,412 
General and administrative expense491 500 967 1,033 
Variable lease cost (1)
Research and development836 160 1,615 370 
General and administrative expense— — — — 
Total $3,899 $3,003 $8,148 $5,815 
(1) Variable lease cost is primarily related to operating expenses associated with the Company’s operating leases.
Summary 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, 2024:
YearAmounts
(in thousands)
2024 (remainder of fiscal year)$6,997 
202515,356 
202615,696 
202714,869 
202813,511 
2029 and thereafter128,356 
Total$194,785 
Less imputed interest$(75,868)
Total operating lease liabilities (includes current portion)$118,917 
Supplemental cash flow and other information related to leases was as follows:
Three Months Ended March 31,Six Months Ended March 31,
2024202320242023
(in thousands)
Cash received for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$— $8,918 $3,099 $17,929 
Right-of-use assets obtained in exchanged for amended operating lease liabilities$— $— $64 $22,582 
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$2,046 $1,098 $4,016 $2,196 
March 31,
20242023
Weighted-average remaining lease term (in years)13.06.6
Weighted-average discount rate8.0 %8.5 %