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Property, Plant, and Equipment, net
 3 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment, net Property, Plant, and Equipment, net
The components of property, plant, and equipment, net consisted of the following:
(in thousands)December 31, 2023September 30, 2023
Equipment$31,701 $31,658 
Furniture and fixtures1,576 1,576 
Computer hardware and software3,220 3,220 
Leasehold improvements9,442 9,442 
Construction in progress2,434 2,508 
Property, plant, and equipment, gross48,373 48,404 
Accumulated depreciation(33,768)(32,887)
Property, plant, and equipment, net$14,605 $15,517 

Depreciation expense totaled $0.9 million and $0.7 million during the three months ended December 31, 2023 and 2022, respectively. During the three months ended December 31, 2023, we sold certain equipment and incurred a gain on sale of assets of $31 thousand. During the three months ended December 31, 2022, the Company consummated the sale of the real property interests in the Tinley Park Facility to 8400 W 185TH STREET INVESTORS, LLC, resulting in a gain on sale of assets of $1.2 million.

As of December 31, 2023 and September 30, 2023, all of our long-lived assets were located in the United States.