Property, Plant and Equipment

6 Months Ended

Jun. 30, 2022

Property, Plant and Equipment [Abstract]

8. PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following:


	As of			As of
(In thousands)	June 30, 2022			December 31, 2021
Engineering and other equipment	$	134,748		$	134,771
Computer hardware and software		74,141			72,274
Building		68,151			68,157
Building and land improvements		35,719			35,578
Furniture and fixtures		19,967			19,917
Land	$	4,575		$	4,575
Total property, plant and equipment		337,301			335,272
Less: accumulated depreciation		(283,869	)		(279,506	)
Total property, plant and equipment, net	$	53,432		$	55,766

Long-lived assets used in operations are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable and the undiscounted cash flows estimated to be generated by the asset are less than the asset’s carrying value. No impairment charges were recognized during the three and six months ended June 30, 2022 and 2021.

Depreciation expense was $2.7 million and $3.0 million for the three months ended June 30, 2022 and 2021 and $5.5 million and $6.1 million for the six months ended June 30, 2022 and 2021, respectively, which is recorded in cost of revenue, selling, general and administrative expenses and research and development expenses in the Condensed Consolidated Statements of Income.