Income Taxes - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 02, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2040	Dec. 31, 2024	Mar. 29, 2020
Income Taxes [Line Items]
Income Tax Expense (Benefit)		$ (11,724)	$ (42,519)	$ (62,936)
Foreign tax rate differences benefit in income tax		25,300	13,100	2,400
Income tax expense reduction due to tax holiday		4,000	3,900	3,000
Net tax credit carryforwards		57,100
Net operating loss carryforwards		205,352					$ 1,200
Operating loss carryforwards that will be used in expiration periods		137,100
Net tax credit carryforwards that will expire		57,109
Net tax credit carry forwards with indefinite carry forward period		5,400
Net tax credit carryforwards that expected to be utilized prior to expiry		17,300
Net decrease in reserve for uncertain tax positions		1,800
Balance at end of the year of unrecognized tax benefits		8,573	6,779	6,591
Estimate the range of reasonably possible changes to unrecognized tax positions		1,700
Accrued interest expense (income) and penalties of unrecognized tax benefits		200	0
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Net tax credit carryforwards		22,400
Capital Loss Carryforward
Income Taxes [Line Items]
Net operating loss carryforwards		100,500
Capital Loss Carryforward | Grass Valley
Income Taxes [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount	$ 23,800
Discontinued Operations
Income Taxes [Line Items]
Income Tax Expense (Benefit)		(22,600)	$ (27,200)	$ 3,300
Scenario, Forecast
Income Taxes [Line Items]
Net tax credit carryforwards that will expire					$ 49,600	$ 2,100
Net Operating Loss Carry Forward Indefinite Period
Income Taxes [Line Items]
Net operating loss carryforwards		58,000
Net Operating Loss Carry Forwards Expires In 2020
Income Taxes [Line Items]
Net operating loss carryforwards		900
Net Operating Loss Carry Forwards Expires Between 2021 And 2024
Income Taxes [Line Items]
Net operating loss carryforwards		19,700
Net Operating Loss Carry Forwards Expires Between 2025 And 2040
Income Taxes [Line Items]
Net operating loss carryforwards		$ 126,800