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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Property Plant And Equipment [Abstract]
Computers, software, office equipment and furniture	$ 2,182	$ 2,170
Research equipment	28,010	27,500
Leasehold improvements	41,977	41,524
Construction in Progress	2,152	345
Land	2,996
Total gross fixed assets	77,317	71,539
Less: Accumulated depreciation and amortization	(25,014)	(22,864)
Property and equipment, net	$ 52,303	$ 48,675

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