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Balance Sheet Accounts
 3 Months Ended
Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Balance Sheet Accounts BALANCE SHEET ACCOUNTS
Property, Plant and Equipment
The following table summarizes the Company’s major classes of property, plant and equipment:
December 31, 2023September 30, 2023
(in thousands)
Land$2,996 $2,996 
Building71,797 — 
Research equipment59,956 56,509 
Furniture2,761 1,540 
Computers and software883 700 
Leasehold improvements103,893 103,813 
Construction in progress136,914 166,655 
379,200 332,213 
Less: Accumulated depreciation and amortization(45,789)(41,951)
Property, plant and equipment, net$333,411 $290,262 
Depreciation and amortization expense for property and equipment for the three months ended December 31, 2023 and 2022 was $3.8 million and $2.3 million, respectively.
As of December 31, 2023, the Company completed the build out of one of its laboratory and office facilities in Verona, Wisconsin, which resulted in the reclassification of related construction in progress to building. Further, the Company commenced depreciation on the newly completed facility over a 39-year period.
Accrued Expenses
Accrued expenses consist of the following:
December 31, 2023September 30, 2023
(in thousands)
Accrued R&D expenses
$18,106 $16,125 
Accrued R&D expenses; co-development
11,104 5,895 
Accrued capital expenditure
11,290 14,044 
Other
6,104 3,699 
Total accrued expense
$46,604 $39,763