Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Property, Plant and Equipment [Abstract]
Computers, software, office equipment and furniture	$ 2,240,000	$ 2,182,000
Land	2,996,000	2,996,000
Research equipment	56,509,000	38,283,000
Leasehold improvements	103,813,000	42,017,000
Construction in progress	166,655,000	56,373,000
Total gross fixed assets	332,213,000	141,851,000
Less: Accumulated depreciation and amortization	(41,951,000)	(31,554,000)
Property and equipment, net	$ 290,262,000	$ 110,297,000