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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Sep. 30, 2021
Property, Plant and Equipment [Abstract]    
Computers, software, office equipment and furniture $ 2,210 $ 2,170
Research equipment 31,678 27,500
Leasehold improvements 42,017 41,524
Construction in Progress 22,338 345
Land 2,996 0
Total gross fixed assets 101,239 71,539
Less: Accumulated depreciation and amortization (29,335) (22,864)
Property and equipment, net $ 71,904 $ 48,675