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Convertible Notes, Other Debts And Finance Lease - Narratives (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 26, 2020
USD ($)
Jun. 26, 2020
EUR (€)
Apr. 30, 2020
CHF (SFr)
Sep. 25, 2020
USD ($)
$ / shares
Jun. 26, 2020
USD ($)
Sep. 27, 2019
USD ($)
Sep. 25, 2020
USD ($)
day
$ / shares
Sep. 27, 2019
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]                    
Common stock, par value | $ / shares       $ 0.001     $ 0.001   $ 0.001  
Fair value of Convertible Senior Notes due 2022 used to settle Convertible Senior Notes due 2020             $ 44,357,000      
Loss on debt extinguishment       $ 0   $ 5,695,000 834,000 $ 5,695,000    
Financing from French government agencies related to various government incentive programs (1) [1]       14,533,000     14,533,000   $ 16,566,000  
Letters of Credit Outstanding, Amount       2,700,000     2,700,000   2,700,000  
Relief loans (2) [2]       $ 6,375,000     $ 6,375,000      
Société Générale S.A. [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage       0.51%     0.51%      
Proceeds from Loans | €   € 5,000,000                
Debt Instrument, Term             12 months      
Relief loans (2)       $ 5,800,000     $ 5,800,000      
UBS Switzerland AG [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage       0.00%     0.00%      
Proceeds from Loans | SFr     SFr 500,000              
Debt Instrument, Term             5 years      
Relief loans (2)       $ 500,000     $ 500,000      
TVN [Member]                    
Debt Instrument [Line Items]                    
Income Taxes Receivable       $ 19,500,000     $ 19,500,000      
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%     0.60%      
Financing from French government agencies related to various government incentive programs (1) [1]       $ 13,000,000.0     $ 13,000,000.0   15,100,000  
Debt Instrument, Basis Spread on Variable Rate             1.30%      
Loans From French Government For R&D Innovation Projects [Member] | TVN [Member]                    
Debt Instrument [Line Items]                    
Financing from French government agencies related to various government incentive programs (1) [1]       $ 1,500,000     $ 1,500,000      
Revolving Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage       1.25%     1.25%      
Line of Credit Facility, Current Borrowing Capacity       $ 0     $ 0   0  
Letters of Credit Outstanding, Amount       200,000     200,000   200,000  
Revolving Credit Facility [Member] | Silicon Valley Bank [Member]                    
Debt Instrument [Line Items]                    
Letters of Credit Outstanding, Amount       $ 2,400,000     $ 2,400,000      
Convertible Note due 2022                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage 4.375%     4.375% 4.375%   4.375%      
Principal amount $ 37,700,000     $ 37,707,000 $ 37,700,000   $ 37,707,000      
Common stock, par value | $ / shares       $ 0.001     $ 0.001      
Debt Instrument, Convertible, Conversion Ratio             173.9978      
Debt Conversion, Converted Instrument, Amount             $ 1,000      
Debt Instrument, Convertible, Conversion Price | $ / shares       $ 5.75     $ 5.75      
Carrying amount of equity component 8,300,000       8,300,000          
Fair Value of Liability Component - Convertible Notes 36,000,000.0       36,000,000.0          
Debt Instrument, Unamortized Discount 1,700,000     $ 1,521,000 1,700,000   $ 1,521,000      
Non-cash Exchange of Convertible Notes - Value of Consideration Received 37,700,000                  
Convertible Note due 2022 | Stock price greater or equal 130 percent of Note Conversion Price [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Convertible, Threshold Trading Days | day             20      
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day             30      
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger             130.00%      
Convertible Note due 2022 | Note price less than 98 percent of stock price times conversion rate [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Convertible, Threshold Trading Days | day             5      
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day             5      
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger             98.00%      
Convertible Note due 2024                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage       2.00%   2.00% 2.00% 2.00%    
Principal amount       $ 115,500,000   $ 115,500,000 $ 115,500,000 $ 115,500,000 115,500,000  
Common stock, par value | $ / shares       $ 0.001     $ 0.001      
Debt Instrument, Convertible, Conversion Ratio             115.5001      
Debt Conversion, Converted Instrument, Amount             $ 1,000      
Debt Instrument, Convertible, Conversion Price | $ / shares       $ 8.66     $ 8.66      
Carrying amount of equity component           24,900,000   24,900,000    
Debt Instrument, Unamortized Discount       $ 20,415,000     $ 20,415,000   23,652,000  
Convertible Note due 2020                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage       4.00%     4.00%     4.00%
Principal amount       $ 8,053,000     $ 8,053,000   45,785,000 $ 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     $ 5.75      
Carrying amount of equity component                   $ 26,100,000
Debt Instrument, Unamortized Discount       $ 72,000     $ 72,000   $ 2,151,000  
Debt Instrument, Repurchase Amount           109,600,000   109,600,000    
Non-cash Exchange of Convertible Notes - Value of Consideration Given 37,700,000                  
Convertible Note due 2020 | Stock price greater or equal 130 percent of Note Conversion Price [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Convertible, Threshold Trading Days | day             20      
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day             30      
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger             130.00%      
Maximum [Member] | Société Générale S.A. [Member]                    
Debt Instrument [Line Items]                    
Option to Extend, Debt Instrument Term             5 years      
Maximum [Member] | Revolving Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Current Borrowing Capacity       $ 25,000,000.0     $ 25,000,000.0      
Convertible Debt | Convertible Note due 2022                    
Debt Instrument [Line Items]                    
Fair value of Convertible Senior Notes due 2022 used to settle Convertible Senior Notes due 2020         44,400,000          
Extinguishment of Debt, Amount 44,400,000                  
Convertible Debt | Convertible Note due 2020                    
Debt Instrument [Line Items]                    
Principal amount 8,100,000       $ 8,100,000          
Loss on debt extinguishment           5,700,000   $ 5,700,000    
Convertible Debt | Long-term Debt [Member] | Convertible Note due 2020 | Privately Negotiated Transactions [Member]                    
Debt Instrument [Line Items]                    
Extinguishment of Debt, Amount           82,500,000        
Convertible Debt | Additional Paid-in Capital [Member] | Convertible Note due 2020 | Privately Negotiated Transactions [Member]                    
Debt Instrument [Line Items]                    
Extinguishment of Debt, Amount           $ 27,100,000        
Liability Component Immediately Prior To Extinguishment [Member] | Convertible Note due 2020                    
Debt Instrument [Line Items]                    
Extinguishment of Debt, Amount 37,400,000                  
Equity Component Allocated to Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] | Convertible Note due 2020                    
Debt Instrument [Line Items]                    
Extinguishment of Debt, Amount $ 7,000,000.0                  
Euribor Future [Member] | Loans Backed By French Research And Development Tax Credit Receivables [Member] | TVN [Member]                    
Debt Instrument [Line Items]                    
Adjusted LIBOR or EURIBOR Rate, Term             1 month      
One Month LIBOR [Member] | Revolving Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member]                    
Debt Instrument [Line Items]                    
Adjusted LIBOR or EURIBOR Rate, Term             1 month      
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%      
LIBOR for interest period of one, two or three months [Member] | Revolving Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate             2.25%      
Two Month LIBOR [Member] | Revolving Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member]                    
Debt Instrument [Line Items]                    
Adjusted LIBOR or EURIBOR Rate, Term             2 months      
Three Month LIBOR [Member] | Revolving Credit Facility [Member] | JPMorgan Chase Bank, N.A. [Member]                    
Debt Instrument [Line Items]                    
Adjusted LIBOR or EURIBOR Rate, Term             3 months      
[1] As of September 25, 2020 and December 31, 2019, loans backed by French R&D tax credit receivables were $13.0 million and $15.1 million, respectively. As of September 25, 2020, the French Subsidiary had an aggregate of $19.5 million of R&D tax credit receivables from the French government from 2021 through 2024. See Note 8, “Balance Sheet Components” for additional information. These tax loans have a fixed rate of 0.6%, plus EURIBOR 1 month + 1.3% and mature between 2021 through 2023. The remaining loans of $1.5 million at September 25, 2020, primarily relate to financial support from French government agencies for R&D innovation projects at minimal interest rates, and these loans mature between 2020 through 2025.
[2] Refer to the below section “Relief Loans” for the description of these loans.