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Property and Equipment
 9 Months Ended
Jun. 30, 2023
Property, Plant and Equipment [Abstract]  
Property and Equipment PROPERTY AND EQUIPMENT
The following table summarizes the Company’s major classes of property and equipment:
June 30, 2023September 30, 2022
(in thousands)
Computers, software, office equipment and furniture$2,198 $2,182 
Land2,996 2,996 
Research equipment50,472 38,283 
Leasehold improvements96,344 42,017 
Construction in progress118,279 56,373 
270,289 141,851 
Less: Accumulated depreciation and amortization(38,920)(31,554)
Property and equipment, net$231,369 $110,297 
Depreciation and amortization expense for property and equipment for the three months ended June 30, 2023 and 2022 was $2.9 million and $2.2 million, respectively. Depreciation and amortization expense for property and equipment for the nine months ended June 30, 2023 and 2022 was $7.4 million and $6.5 million, respectively.
The increase in the construction in progress during the nine months ended June 30, 2023 was mainly due to the continuing developments of manufacturing, laboratory and office facilities in Verona, Wisconsin as well as a new laboratory and office facility in San Diego, California. In May 2023, the Company completed the development of the San Diego facility, which resulted in the reclassification of construction in progress as leasehold improvements as of June 30, 2023. See Note 7.