PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Property and equipment consisted of the following at December 31, 2021 and 2020 (in thousands):


	December 31,
	2021		2020
Computer and video equipment and software	$	133,294	$	137,489
Manufacturing tooling and testbeds	4,889		4,781
Office equipment	4,909		4,957
Furniture, fixtures and other	9,915		10,133
Leasehold improvements	37,034		36,784
	190,041		194,144
Less: accumulated depreciation and amortization	174,013		177,330
Total	$	16,028	$	16,814

We capitalize certain development costs incurred in connection with our internal use software. For the year ended December 31, 2021, we capitalized $2.6 million of contract labor and internal labor costs related to internal use software, and recorded the capitalized costs in computer and video equipment and software. There were $1.6 million of contract labor and internal labor costs capitalized for the year ended December 31, 2020. Internal use software is amortized on a straight line basis over its estimated useful life of three years, and we recorded $3.1 million of amortization expense during each 2021 and 2020, and $1.9 million of amortization expense in 2019.

Depreciation and amortization expense related to property and equipment was $8.3 million, $8.5 million, and $9.2 million for the years ended December 31, 2021, 2020, and 2019 respectively.