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Balance Sheet Accounts (Tables)
 9 Months Ended
Jun. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Property, Plant and Equipment
The following table summarizes the Company’s major classes of property, plant and equipment:
June 30, 2025September 30, 2024
(in thousands)
Land$2,996 $2,996 
Buildings249,245 75,988 
Research equipment59,561 65,353 
Manufacturing equipment16,548 — 
Furniture5,594 5,594 
Computers and software1,059 981 
Leasehold improvements104,403 104,410 
Construction in progress15,872 188,731 
455,278 444,053 
Less: Accumulated depreciation and amortization(74,230)(58,021)
Property, plant and equipment, net$381,048 $386,032 
Schedule of Accrued Expenses
Accrued expenses consisted of the following as of:
June 30, 2025September 30, 2024
(in thousands)
Accrued research and development expenses
$31,708 $28,069 
Accrued research and development expenses; co-development
24,627 23,351 
Accrued capital expenditures
346 4,206 
Other
8,137 7,391 
Total accrued expenses
$64,818 $63,017