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Property, Plant, and Equipment, Net
 12 Months Ended
Dec. 31, 2020
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)20202019
Buildings$19,984 $18,570 
Computer equipment10,213 9,935 
Furniture and fixtures3,972 3,905 
Leasehold and building improvements39,656 37,527 
Machinery and equipment101,117 94,274 
Software24,915 25,910 
Tooling34,379 32,267 
234,236 222,388 
Accumulated depreciation(154,216)(135,254)
80,020 87,134 
Construction in progress7,265 3,598 
Total property, plant, and equipment, net$87,285 $90,732 

Depreciation expense was $23.2 million, $24.7 million and $26.4 million for the years ended December 31, 2020, 2019, and 2018, respectively.

During the year ended December 31, 2018, we incurred $2.9 million in impairment on tooling and equipment as a result of the transition of manufacturing operations between our PRC-based manufacturing facilities following the closure of our Guangzhou factory, which was sold in 2018. We incurred an additional $0.1 million and $2.0 million of impairment on factory equipment during the years ended December 31, 2019 and 2018, respectively, as a result of the transition of certain manufacturing operations out of the PRC in response to tariffs enacted in the U.S. in 2018 on certain products manufactured in the PRC and imported into the U.S. These impairment charges, aggregating to $0.1 million and $4.9 million, are recorded within cost of sales for the year ended December 31, 2019 and 2018, respectively. Impairment charges were immaterial for the year ended December 31, 2020.

Construction in progress was as follows:
December 31,
(In thousands)20202019
Leasehold and building improvements$2,487 $574 
Machinery and equipment3,075 1,428 
Software 213 518 
Tooling1,397 759 
Other93 319 
Total construction in progress
$7,265 $3,598 

We expect that most of the assets under construction will be placed into service during the first six months of 2021. 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 right-of-use assets, were as follows: 
December 31,
(In thousands)20202019
United States$15,411 $19,938 
People's Republic of China64,197 67,625 
Mexico22,410 16,644 
All other countries4,789 6,351 
Total long-lived tangible assets$106,807 $110,558