Leases (Tables)

6 Months Ended

Mar. 31, 2023

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 Liabilities	Classification	March 31, 2023		September 30, 2022
		(in thousands)
Operating lease assets	Right-of-use assets	$	41,114	$	58,291
Current operating lease liabilities	Lease liabilities	2,711		2,776
Non-current operating lease liabilities	Lease liabilities, net of current portion	80,070		78,800

		Three Months Ended March 31,				Six Months Ended March 31,
Lease Cost	Classification	2023		2022		2023		2022
		(in thousands)
Operating lease cost	Research and development	$	2,343	$	905	$	4,412	$	1,783
	General and administrative expense	500		420		1,033		840
Variable lease cost	Research and development	160		182		370		340
	General and administrative expense	—		—		—		—
Total		$	3,003	$	1,507	$	5,815	$	2,963

Summary of Maturities of Operating Lease Liabilities on an Undiscounted Basis

The following table presents payments of operating lease liabilities on an undiscounted basis as of March 31, 2023:

Year	Amounts
	(in thousands)
2023 (remainder of fiscal year)	$	3,070
2024	8,094
2025	11,800
2026	12,138
2027	11,297
2028 and thereafter	102,813
Total	$	149,212
Less imputed interest	(66,431)
Total operating lease liabilities (includes current portion)	$	82,781

Supplemental cash flow and other information related to leases was as follows:

	Six Months Ended March 31,
	2023			2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases (in thousands)	$	2,503		$	2,171
	March 31, 2023
	2023			2022
Weighted-average remaining lease term (in years)	6.6			7.6
Weighted-average discount rate	8.5		%	8.5		%