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Property, Plant, and Equipment, Net
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment, Net Property, Plant, and Equipment, Net
Property, plant, and equipment, net were as follows:
December 31,
(In thousands)20222021
Buildings$18,291 $19,830 
Computer equipment9,344 9,655 
Furniture and fixtures3,529 3,905 
Leasehold and building improvements39,761 41,437 
Machinery and equipment96,947 102,864 
Software23,607 23,993 
Tooling31,898 34,000 
223,377 235,684 
Accumulated depreciation(170,474)(165,906)
52,903 69,778 
Construction in progress9,888 4,869 
Total property, plant, and equipment, net$62,791 $74,647 
Depreciation expense was $19.9 million, $22.8 million and $23.2 million for the years ended December 31, 2022, 2021 and 2020, respectively.

During the year ended December 31, 2022, we incurred $2.9 million in impairment charges, recorded in cost of sales, relating to the underutilization of certain property, plant and equipment in our Mexico factory. During the year ended December 31, 2021, we incurred $3.3 million in impairment charges, recorded in cost of sales, relating to the underutilization of property, plant and equipment in our PRC-based factories, as a result of our long-term factory planning strategy of reducing our concentration risk in that region. Impairment charges were immaterial for the year ended December 31, 2020.

Construction in progress was as follows:
December 31,
(In thousands)20222021
Leasehold and building improvements$475 $100 
Machinery and equipment2,282 1,912 
Software 4,862 1,272 
Tooling1,827 1,168 
Other442 417 
Total construction in progress
$9,888 $4,869 

We expect that most of the assets under construction will be placed into service during the first six months of 2023. We will begin to depreciate the cost of these assets under construction once they are placed into service.

Long-lived tangible assets by geographic area, which include property, plant, and equipment, net and operating lease ROU assets, were as follows: 
December 31,
(In thousands)20222021
United States$16,427 $16,804 
People's Republic of China42,893 52,851 
Mexico14,402 20,509 
Vietnam6,923 — 
All other countries3,745 4,330 
Total long-lived tangible assets$84,390 $94,494