Property, Plant and Equipment

6 Months Ended

Jun. 30, 2021

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, 2021			December 31, 2020
Land	$	4,575		$	4,575
Building and land improvements		34,961			35,142
Building		68,161			68,169
Furniture and fixtures		19,936			19,965
Computer hardware and software		71,262			70,942
Engineering and other equipment		134,090			132,920
Total property, plant and equipment		332,985			331,713
Less: accumulated depreciation	$	(274,715	)	$	(269,314	)
Total property, plant and equipment, net	$	58,270		$	62,399

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. Due to the current economic environment, particularly related to COVID-19, the Company assessed impairment triggers related to long-lived assets during the second quarters of 2021 and 2020. Based on this assessment, no triggers occurred to perform an impairment test, and no impairment losses of long-lived assets were recorded for the three or six months ended June 30, 2021 or 2020.

Depreciation expense was $3.0 million for each of the three months ended June 30, 2021 and 2020 and $6.1 million and $6.0 million for the six months ended June 30, 2021 and 2020, 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 (Loss).