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Balance Sheet Accounts (Tables)
 9 Months Ended
Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Property and Equipment
The following table summarizes the Company’s major classes of property, plant and equipment:
June 30, 2024September 30, 2023
(in thousands)
Land$2,996 $2,996 
Building75,868 — 
Research equipment64,207 56,509 
Furniture5,593 1,540 
Computers and software976 700 
Leasehold improvements104,396 103,813 
Construction in progress175,778 166,655 
429,814 332,213 
Less: Accumulated depreciation and amortization(53,903)(41,951)
Property, plant and equipment, net$375,911 $290,262 
Schedule of Accrued Expenses
Accrued expenses consist of the following:
June 30, 2024September 30, 2023
(in thousands)
Accrued R&D expenses
$17,911 $16,125 
Accrued R&D expenses; co-development
21,280 5,895 
Accrued capital expenditures
6,909 14,044 
Other
1,799 3,699 
Total accrued expenses
$47,899 $39,763