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Property, Plant, and Equipment
 9 Months Ended
Sep. 30, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment Property, Plant, and Equipment
Property, plant, and equipment consist of the following:
(In thousands)September 30, 2024December 31, 2023Estimated Useful Life
Buildings and land$1,318 $1,318 
30 years - Buildings
Enterprise hardware and software1,815 1,857 3 years
Leaseholds1,611 1,787 Lesser of lease term or estimated useful life
Equipment1,484 1,263 7 years
Furniture234 202 5 years
Equipment in process216 — 
Property, plant and equipment, gross6,678 6,427 
Accumulated depreciation(4,949)(5,075)
Property, plant and equipment, net$1,729 $1,352 
Depreciation expense for the three and nine months ended September 30, 2024 and 2023 was less than $0.1 million for each period.