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Balance Sheet Accounts
 12 Months Ended
Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Balance Sheet Accounts BALANCE SHEET ACCOUNTSProperty, Plant and Equipment
The following table summarizes the Company’s major classes of property, plant and equipment:
September 30,
20242023
(in thousands)
Land$2,996 $2,996 
Building75,988 — 
Research equipment65,353 56,509 
Furniture5,594 1,540 
Computers and software981 700 
Leasehold improvements104,410 103,813 
Construction in progress188,731 166,655 
444,053 332,213 
Less: Accumulated depreciation and amortization(58,021)(41,951)
Property, plant and equipment, net$386,032 $290,262 
Depreciation and amortization expense for property, plant and equipment for the years ended September 30, 2024, 2023, and 2022 was $16.9 million, $10.7 million and $8.7 million, respectively.
During the first quarter of fiscal 2024, the Company completed the build out of one of its laboratory and office facilities in Verona, Wisconsin, which resulted in the reclassification of $76.0 million from construction in progress to building as of September 30, 2024. Further, the Company commenced depreciation on the newly completed facility over a 39-year period.
Accrued Expenses
Accrued expenses consist of the following:
September 30,
20242023
(in thousands)
Accrued R&D expenses$28,069 $12,826 
Accrued R&D expenses; co-development23,351 5,895 
Accrued capital expenditures4,206 14,044 
Other7,391 6,998 
       Total accrued expenses$63,017 $39,763