Balance Sheet Accounts (Tables)

12 Months Ended

Sep. 30, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Property, Plant and Equipment

The estimated useful lives of property, plant and equipment are as follows (in years):

	Estimated Useful Lives
Building	39
Research equipment	5 to 10
Furniture	7
Computers and software	3 to 5
Leasehold improvements	3 to 15

The following table summarizes the Company’s major classes of property, plant and equipment:

	September 30,
	2024		2023
	(in thousands)
Land	$	2,996	$	2,996
Building	75,988		—
Research equipment	65,353		56,509
Furniture	5,594		1,540
Computers and software	981		700
Leasehold improvements	104,410		103,813
Construction in progress	188,731		166,655
	444,053		332,213
Less: Accumulated depreciation and amortization	(58,021)		(41,951)
Property, plant and equipment, net	$	386,032	$	290,262

Schedule of Accrued Liabilities

Accrued expenses consist of the following:

	September 30,
	2024		2023
	(in thousands)
Accrued R&D expenses	$	28,069	$	12,826
Accrued R&D expenses; co-development	23,351		5,895
Accrued capital expenditures	4,206		14,044
Other	7,391		6,998
Total accrued expenses	$	63,017	$	39,763