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Property, Plant and Equipment, net
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net
Note G – Property, Plant and Equipment, net
Property, plant and equipment, net were as follows:
 December 31, 2023December 31, 2022
United StatesEuropeTotalUnited StatesEuropeTotal
Computer equipment
$1,755 $559 $2,314 $1,256 $252 $1,508 
Furniture and fixtures
1,181 39 1,220 1,062 38 1,100 
Laboratory equipment
5,086 594 5,680 3,646 483 4,129 
Leasehold improvements
2,764 4,683 7,447 2,229 4,475 6,704 
Finance lease ROU assets— 2,004 2,004 — 944 944 
Construction in process3,782 — 3,782 1,408 — 1,408 
Property, plant and equipment, gross14,568 7,879 22,447 9,601 6,192 15,793 
Less: accumulated depreciation
(4,631)(1,907)(6,538)(2,785)(247)(3,032)
Total property, plant and equipment, net$9,937 $5,972 $15,909 $6,816 $5,945 $12,761 

There was no impairment recognized related to property, plant and equipment during the year ended December 31, 2023. During the year ended December 31, 2022, the Company recognized impairment expense of $96.6 million, of which $13.1 million related to certain property, plant and equipment asset groups within the Mission Solutions reporting unit. Please refer to Note T – Impairment Expense for additional information related to this impairment.

The table below presents the depreciation expense related to property, plant and equipment for the following periods:
Year Ended
 December 31, 2023December 31, 2022
Depreciation expense
$3,512 $3,325