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Property and Equipment
 6 Months Ended
Mar. 31, 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:
March 31, 2023September 30, 2022
(in thousands)
Computers, software, office equipment and furniture$2,198 $2,182 
Land2,996 2,996 
Research equipment46,873 38,283 
Leasehold improvements42,017 42,017 
Construction in progress127,216 56,373 
221,300 141,851 
Less: Accumulated depreciation and amortization(36,072)(31,554)
Property and equipment, net$185,228 $110,297 
Depreciation and amortization expense for property and equipment for each of the three months ended March 31, 2023 and 2022 was $2.2 million. Depreciation and amortization expense for property and equipment for the six months ended March 31, 2023 and 2022 was $4.5 million and $4.3 million, respectively.
The increase in the construction in progress during the six months ended March 31, 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. See Note 7.