PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 190,041	$ 194,144
Accumulated depreciation and amortization	174,013	177,330
Property and equipment, net	16,028	16,814
Capitalized Computer Software, Additions	2,600	1,600
Capitalized Computer Software, Amortization	3,100	3,100	$ 1,900
Annual depreciation and amortization	$ 8,300	8,500	$ 9,200
Internal Use Software [Domain]
Property, Plant and Equipment [Line Items]
Capitalized Computer Software, Useful Life	3 years
Computer and video equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 133,294	137,489
Manufacturing tooling and testbeds [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,889	4,781
Office equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,909	4,957
Furniture, fixtures and other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,915	10,133
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 37,034	$ 36,784

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Additions made to capitalized computer software costs during the period.

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