Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Nov. 12, 2019	Mar. 29, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
U.S. Statutory Federal Tax Rate				21.00%	21.00%	35.00%
World Consolidated Loss Before Tax				$ 6,596	$ 16,948	$ 84,707	[1]
Income Tax Expense (Benefit)				$ (672)	$ 4,087	$ (1,752)
Effective Income Tax Rate Reconciliation, Percent				10.00%	(24.00%)	2.00%
One-time benefit due to changes in Company's global tax structure			$ 2,000	$ 2,000
Benefit from a Valuation Allowance Release				923	$ (1,449)	$ 2,834
Valuation Allowance Deferred Tax Asset Addition				23,929	928	9,028
Valuation Allowance Deferred Tax Asset Deductions				5,555	1,540	5,752
Deferred Tax Assets, Valuation Allowance			$ 77,144	95,518	$ 77,144	77,756		$ 74,480
Number of Days to Petition the U.S. Supreme Court	90 days
Cumulative Undistributed Earnings of non-U.S. subsidiaries intended to be indefinitely reinvested				$ 20,500
More Likely Than Not Threshold Recognition of Uncertain Tax Position				50.00%
Gross unrecognized tax benefits including interest and penalties				$ 15,700
US Tax Cuts Jobs Act [Member] | AMT credit carryover [Member]
Benefit from a Valuation Allowance Release						$ 2,600
Foreign [Member]
Benefit from a Valuation Allowance Release		$ 800		800
Operating Loss Carryforwards				159,800
Federal [Member]
Operating Loss Carryforwards				31,200
Tax credit carryovers				$ 13,700
Year that federal tax credits expire				Jan. 01, 2031
California Franchise Tax Board [Member]
Operating Loss Carryforwards				$ 27,000
Tax credit carryovers				$ 35,700
Tax credit expiration				will not expire
State [Member]
Operating Loss Carryforwards				$ 55,300
Israel Tax Authority [Member]
Valuation Allowance Deferred Tax Asset Deductions				$ 5,600
Minimum [Member] | Federal [Member]
Operating loss carryforwards, expiration date				Jan. 01, 2026
Minimum [Member] | California Franchise Tax Board [Member]
Operating loss carryforwards, expiration date				Jan. 01, 2026
Maximum [Member] | Federal [Member]
Operating loss carryforwards, expiration date				Jan. 01, 2039
Maximum [Member] | California Franchise Tax Board [Member]
Operating loss carryforwards, expiration date				Jan. 01, 2039

[1] For the year ended December 31, 2017, the unallocated corporate expenses included acquisition- and integration-related costs, French VDP costs (see Note 11, “Restructuring and Related charges,” for more information on French VDP) and Cable Access product line inventory obsolescence costs, totaling $7.9 million. In addition, in fiscal 2017, the unallocated corporate expenses included $8.0 million of Avid litigation settlement cost and associated legal fees (see Note 20, “Legal Proceedings,” for more information). The remaining unallocated corporate expenses for all years presented above include primarily other restructuring charges and excess facilities charges.