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Income Taxes - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 01, 2017
Feb. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2017
Dec. 31, 2014
Debt Instrument, Face Amount     $ 128,250,000 $ 128,250,000      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     35.00% 35.00% 35.00%    
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount     $ (834,000)        
World Consolidated Loss Before Tax     84,707,000 [1] $ 80,430,000 $ 16,068,000    
Income Tax Benefit     $ 1,752,000 $ 8,116,000 $ 407,000    
Effective Income Tax Rate Reconciliation, Percent     2.00% 10.00% 3.00%    
Deferred Tax Assets, Valuation Allowance     $ 77,756,000 $ 74,480,000 $ 64,545,000   $ 75,199,000
Decrease in balance as a result of a lapse of the applicable statues of limitations     2,200,000 1,000,000 900,000    
Gross unrecognized tax benefits including interest and penalties     18,800,000        
Accrued potential interest related to unrecognized tax benefits     500,000 500,000      
Cumulative Undistributed Earnings of non-U.S. subsidiaries intended to be indefinitely reinvested     $ 10,500,000        
More Likely Than Not Threshold Recognition of Uncertain Tax Position     50.00%        
Deferred Tax Assets, Net     $ 10,462,000 10,181,000      
US Tax Cuts Jobs Act [Member] | AMT credit carryover [Member]              
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount     2,600,000        
Income Taxes Receivable, Current     2,600,000        
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     (2,600,000)        
Foreign [Member]              
Operating Loss Carryforwards     111,400,000        
Federal [Member]              
Operating Loss Carryforwards     49,100,000        
Tax credit carryovers     $ 11,300,000        
Year that federal tax credits expire     Jan. 01, 2031        
California Franchise Tax Board [Member]              
Operating Loss Carryforwards     $ 25,400,000        
State [Member]              
Operating Loss Carryforwards     53,200,000        
Tax credit carryovers     $ 33,900,000        
Tax credit expiration     will not expire        
Switzerland [Member]              
Tax savings due to reduction in tax rate     $ 600,000 $ 700,000 $ 700,000    
Increase in diluted earnings per share     $ 0.007 $ 0.008 $ 0.008    
Benefits from a tax ruling     The Company’s operations in Switzerland are subject to a reduced tax rate under the Switzerland tax holiday which requires various thresholds of investment and employment in Switzerland.        
Additional period for renewal for investment and employment in foreign country     effective through the end of 2018        
Minimum [Member] | Federal [Member]              
Operating loss carryforwards, expiration date     Jan. 01, 2018        
Minimum [Member] | California Franchise Tax Board [Member]              
Operating loss carryforwards, expiration date     Jan. 01, 2018        
Maximum [Member] | Federal [Member]              
Operating loss carryforwards, expiration date     Jan. 01, 2037        
Maximum [Member] | California Franchise Tax Board [Member]              
Operating loss carryforwards, expiration date     Jan. 01, 2037        
Foreign [Member]              
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     $ (3,200,000)        
Valuation Allowance, Operating Loss Carryforwards [Member]              
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     9,000,000        
US Tax Cuts Jobs Act [Member]              
Income Tax Benefit     0        
Tax Year 2012 [Member] | Federal [Member]              
Decrease in balance as a result of a lapse of the applicable statues of limitations       $ 1,100,000      
Subsequent Event [Member] | US Tax Cuts Jobs Act [Member]              
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00%          
Accounting Standards Update 2016-16 [Member]              
Deferred Tax Assets, Valuation Allowance           $ 2,100,000  
Deferred Tax Assets, Tax Deferred Expense           300,000  
Cumulative Effect on Retained Earnings, Net of Tax $ 1,434,000            
Deferred Tax Assets, Net           $ 1,100,000  
Accounting Standards Update 2016-09 [Member]              
Cumulative Effect on Retained Earnings, Net of Tax 69,000            
Deferred Tax Assets Gross [Member] | US Tax Cuts Jobs Act [Member]              
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability     14,500,000        
Deferred Tax Assets Gross [Member] | Accounting Standards Update 2016-09 [Member]              
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income 4,600,000            
Valuation Allowance of Deferred Tax Assets [Member] | US Tax Cuts Jobs Act [Member]              
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability     $ (14,500,000)        
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]              
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income $ 0            
[1] For the years ended December 31, 2017 and 2016, the unallocated corporate expenses included TVN acquisition- and integration-related costs, TVN VDP costs (see Note 10, “Restructuring and Related charges-TVN VDP,” for more information on TVN VDP ) and Cable Edge product line inventory obsolescence costs, totaling $7.9 million and $32.2 million, respectively. In addition, in fiscal year 2017, the unallocated corporate expenses included $8.0 million of Avid litigation settlement cost and associated legal fees (see Note 19, “Legal Proceedings,” for more information). The remaining unallocated corporate expenses for all years presented above include primarily other restructuring charges and excess facilities charges.