Leases (Tables)

9 Months Ended

Jun. 30, 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	June 30, 2023		September 30, 2022
		(in thousands)
Operating lease assets	Right-of-use assets	$	40,667	$	58,291
Current operating lease liabilities	Lease liabilities	2,823		2,776
Non-current operating lease liabilities	Lease liabilities, net of current portion	79,911		78,800

		Three Months Ended June 30,				Nine Months Ended June 30,
Lease Cost	Classification	2023		2022		2023		2022
		(in thousands)
Operating lease cost	Research and development	$	3,323	$	2,974	$	7,735	$	4,757
	General and administrative expense	509		448		1,542		1,288
Variable lease cost (1)	Research and development	257		179		627		519
	General and administrative expense	—		—		—		—
Total		$	4,089	$	3,601	$	9,904	$	6,564

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 June 30, 2023:

Year	Amounts
	(in thousands)
2023 (remainder of fiscal year)	$	1,143
2024	8,094
2025	11,800
2026	12,148
2027	11,320
2028 and thereafter	102,812
Total	$	147,317
Less imputed interest	$	(64,583)
Total operating lease liabilities (includes current portion)	$	82,734

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

	Nine Months Ended June 30,
	2023		2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases (in thousands)	4,430		3,398
	June 30,
	2023		2022
Weighted-average remaining lease term (in years)	13.4		7.3
Weighted-average discount rate	8.0	%	8.5	%