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Convertible Notes and Credit Facilities - Additional Information (Detail)
3 Months Ended 12 Months Ended
Sep. 27, 2019
USD ($)
day
$ / shares
Dec. 31, 2019
USD ($)
day
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
day
$ / shares
Sep. 10, 2019
USD ($)
Sep. 29, 2017
USD ($)
Debt Instrument [Line Items]              
Common Stock, Par Value Per Share | $ / shares   $ 0.001 $ 0.001        
Loss on debt extinguishment   $ 5,695,000 $ 0 $ 0      
Payments of Debt Issuance Costs   4,277,000          
Proceeds from convertible debt   115,500,000 0 $ 0      
Reclassification from APIC to Convertible Debt in Mezzanine Equity   2,410,000          
Loans Payable to Bank [1]   16,566,000 18,783,000        
Income Taxes Receivable   $ 23,200,000          
Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage   1.25%          
Line of Credit Facility, Current Borrowing Capacity   $ 0          
Letters of Credit Outstanding, Amount   300,000          
Revolving Credit Facility [Member] | Silicon Valley Bank [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Current Borrowing Capacity           $ 0 $ 15,000,000
Letters of Credit Outstanding, Amount           $ 2,200,000  
Outstanding Borrowing Limit Based on Eligible Receivables, Percentage             85.00%
Revolving Credit Facility [Member] | Maximum [Member] | JPMORGAN CHASE BANK N.A. [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Current Borrowing Capacity   $ 25,000,000          
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Basis Spread on Variable Rate   2.50%          
One Month LIBOR [Member] | Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member]              
Debt Instrument [Line Items]              
Maturity interest period, Variable Rate   1 month          
Two Month LIBOR [Member] | Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member]              
Debt Instrument [Line Items]              
Maturity interest period, Variable Rate   2 months          
Three Month LIBOR [Member] | Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member]              
Debt Instrument [Line Items]              
Maturity interest period, Variable Rate   3 months          
TVN [Member]              
Debt Instrument [Line Items]              
Income Taxes Receivable   $ 23,200,000          
Loans Backed By French Research And Development Tax Credit Receivables [Member] | TVN [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage   0.60%          
Loans Payable to Bank   $ 15,100,000 16,700,000        
Debt Instrument, Basis Spread on Variable Rate   1.30%          
Loans Backed By French Research And Development Tax Credit Receivables [Member] | TVN [Member] | Euribor Future [Member]              
Debt Instrument [Line Items]              
Maturity interest period, Variable Rate   1 month          
Loans From French Government For R&D Innovation Projects [Member]              
Debt Instrument [Line Items]              
Loans Payable to Bank   $ 1,500,000 2,100,000        
Convertible Note due 2024 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage 2.00% 2.00%          
Debt Instrument, Face Amount $ 115,500,000 $ 115,500,000          
Common Stock, Par Value Per Share | $ / shares $ 0.001            
Debt Instrument, Convertible, Conversion Ratio 115.5001            
Debt Conversion, Converted Instrument, Amount $ 1,000            
Debt Instrument, Convertible, Conversion Price | $ / shares $ 8.66            
Debt Instrument, Convertible, Carrying Amount of Equity Component $ 24,900,000            
Convertible Note due 2024 [Member] | Stock price greater or equal 130 percent of Note Conversion Price [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day 30            
Debt Instrument, Convertible, Threshold Trading Days | day 20            
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 130.00%            
Convertible Note due 2024 [Member] | Note price less than 98 percent of stock price times conversion rate [Member]              
Debt Instrument [Line Items]              
Debt Conversion, Converted Instrument, Amount $ 1,000            
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day 5            
Debt Instrument, Convertible, Threshold Trading Days | day 5            
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 98.00%            
Convertible Note due 2020 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage   4.00%     4.00%    
Debt Instrument, Face Amount   $ 45,785,000 $ 128,250,000   $ 128,250,000    
Debt Instrument, Convertible, Conversion Ratio         173.9978    
Debt Conversion, Converted Instrument, Amount         $ 1,000    
Debt Instrument, Convertible, Conversion Price | $ / shares         $ 5.75    
Debt Instrument, Repurchase Amount $ 109,600,000            
Debt Instrument, Convertible, Carrying Amount of Equity Component         $ 26,100,000    
Reclassification from APIC to Convertible Debt in Mezzanine Equity   $ 2,400,000          
Convertible Note due 2020 [Member] | Stock price greater or equal 130 percent of Note Conversion Price [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day   30          
Debt Instrument, Convertible, Threshold Trading Days | day   20          
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   130.00%          
Convertible Note due 2020 [Member] | Note price less than 98 percent of stock price times conversion rate [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day         5    
Debt Instrument, Convertible, Threshold Trading Days | day         5    
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger         98.00%    
Convertible Debt [Member] | Convertible Note due 2020 [Member]              
Debt Instrument [Line Items]              
Loss on debt extinguishment 5,700,000            
Convertible Debt [Member] | Long-term Debt [Member] | Convertible Note due 2020 [Member] | Privately Negotiated Transactions [Member]              
Debt Instrument [Line Items]              
Extinguishment of Debt, Amount 82,500,000            
Convertible Debt [Member] | Additional Paid-in Capital [Member] | Convertible Note due 2020 [Member] | Privately Negotiated Transactions [Member]              
Debt Instrument [Line Items]              
Extinguishment of Debt, Amount $ 27,100,000            
[1] Loans backed by French R&D tax credit receivables were $15.1 million and $16.7 million as of December 31, 2019 and 2018, respectively. As of December 31, 2019, the French Subsidiary had an aggregate of $23.2 million of R&D tax credit receivables from the French government from 2020 through 2023. (See Note 10, “Certain Balance Sheet Components-Prepaid expenses and other current assets” for more information). These tax loans have a fixed rate of 0.6%, plus EURIBOR 1 month plus 1.3% and mature between 2020 through 2022. The remaining loans of $1.5 million and $2.1 million as of December 31, 2019 and 2018, respectively, primarily relate to financial support from French government agencies for R&D innovation projects at minimal interest rates, and the loans outstanding at December 31, 2019 mature between 2020 through 2025.