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Convertible Notes, Other Debts And Capital Leases - Additional Information (Detail)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended
Dec. 14, 2015
shares
Dec. 31, 2015
USD ($)
$ / shares
Apr. 01, 2016
USD ($)
$ / shares
Apr. 01, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Apr. 01, 2016
EUR (€)
Debt Instrument [Line Items]            
Financing from French government agencies related to various government incentive programs (1) [1]     $ 18,980,000 $ 18,980,000    
Debt Instrument, Interest Rate, Stated Percentage   4.00%     4.00%  
Debt Instrument, Face Amount   $ 128,250,000 $ 128,250,000 128,250,000 $ 128,250,000  
Debt Issuance Cost   $ 3,500,000   $ 4,100,000    
Debt Instrument, Convertible, Conversion Ratio         173.9978  
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 5.75 $ 5.75 $ 5.75 $ 5.75  
Debt Conversion, Converted Instrument, Amount         $ 1,000  
Percentage Of Principal Amount Of Convertible Notes Is Equal To Repurchase Price         100.00%  
Debt Instrument Convertible Allocated Amount of Equity Component   $ 26,925,000 $ 26,925,000 $ 26,925,000 $ 26,925,000  
Debt Instrument, Unamortized Discount (Premium), Net   4,100,000     4,100,000  
Unamortized Debt Issuance Expense   3,223,000 3,095,000 3,095,000 3,223,000  
Debt Instrument Convertible Equity Component Issuance Cost   $ 863,000 863,000 863,000 $ 863,000  
Stock price greater or equal 130 percent of Note Conversion Price [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Convertible, Threshold Trading Days         20  
Debt Instrument, Convertible, Threshold Consecutive Trading Days         30 days  
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger         130.00%  
Note price less than 98 percent of stock price times conversion rate [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Convertible, Threshold Trading Days         5  
Debt Instrument, Convertible, Threshold Consecutive Trading Days         5 days  
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger         98.00%  
Privately Negotiated Transactions [Member]            
Debt Instrument [Line Items]            
Proceeds from Convertible Debt         $ 49,900,000  
Stock Repurchased and Retired During Period, Shares | shares 11.1          
TVN [Member]            
Debt Instrument [Line Items]            
Income Taxes Receivable     27,600,000 27,600,000    
Loans Backed By French Research And Development Tax Credit Receivables [Member] | TVN [Member]            
Debt Instrument [Line Items]            
Financing from French government agencies related to various government incentive programs (1) [1]     $ 15,300,000 $ 15,300,000    
Debt Instrument, Interest Rate, Stated Percentage     0.60% 0.60%   0.60%
Adjusted EURIBOR Rate, Term     1 month      
Income Taxes Receivable     $ 27,600,000 $ 27,600,000    
Debt Instrument, Basis Spread on Variable Rate     1.30%      
Loans From French Government For R&D Innovation Projects [Member]            
Debt Instrument [Line Items]            
Financing from French government agencies related to various government incentive programs (1) [1]     $ 3,700,000 $ 3,700,000    
Foreign Line of Credit [Member] | BPI France [Member]            
Debt Instrument [Line Items]            
Maximum Advance Credit Line For Receivables | €           € 2,000,000
Restricted Cash and Cash Equivalents | €           200,000
Foreign Line of Credit [Member] | GE Capital Cofacredit [Member]            
Debt Instrument [Line Items]            
Secured Borrowing On Receivables, Percentage Available, Maximum     90.00%      
Guarantee Fund Percentage of Qualified Customer Invoices     10.00%      
Guarantee Fund on Qualified Customer Invoices | €           € 80,000
Holdback Reserve on Receivables, Percentage     10.00%      
[1] As of April 1, 2016, the Company’s TVN French Subsidiary had an aggregate of $19.0 million of loans due to various financing programs of French government agencies, $15.3 million of which is related to loans backed by French R&D tax credit receivables. As of April 1, 2016, the TVN French Subsidiary had an aggregate of $27.6 million of R&D tax credit receivables from the French government from June 2016 through June 2018. (See Note 8, “Balance Sheet Components-Prepaid expenses and other current assets” for more information). This R&D tax loan has a fixed rate of 0.6%, plus EURIBOR 1 month + 1.3% and matures between 2016 through 2018. The remaining loans of $3.7 million at April 1, 2016 primarily relates to financial support from French government agencies for R&D innovation projects at minimal interest rates and these loans mature between 2020 through 2023.