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Convertible Notes, Other Debts And Finance Lease - Narratives (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 26, 2020
USD ($)
$ / shares
Jun. 26, 2020
EUR (€)
Apr. 30, 2020
CHF (SFr)
Jun. 26, 2020
USD ($)
day
$ / shares
Sep. 27, 2019
USD ($)
$ / shares
Jun. 26, 2020
USD ($)
$ / shares
Jun. 28, 2019
USD ($)
Dec. 31, 2019
USD ($)
day
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Debt Instrument [Line Items]                  
Common stock, par value | $ / shares $ 0.001     $ 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       $ 834,000   834,000 $ 0    
Financing from French government agencies related to various government incentive programs (1) [1] $ 13,991,000     13,991,000   13,991,000   $ 16,566,000  
Letters of Credit Outstanding, Amount 2,700,000     2,700,000   2,700,000   2,700,000  
Relief loans (2) [2] $ 6,131,000     $ 6,131,000   $ 6,131,000      
Société Générale S.A. [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage 0.51%     0.51%   0.51%      
Proceeds from Loans | €   € 5,000,000              
Debt Instrument, Term 12 months 12 months              
Relief loans (2) $ 5,600,000     $ 5,600,000   $ 5,600,000      
UBS Switzerland AG [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage 0.00%     0.00%   0.00%      
Proceeds from Loans | SFr     SFr 500,000            
Debt Instrument, Term     5 years            
Relief loans (2) $ 500,000     $ 500,000   $ 500,000      
TVN [Member]                  
Debt Instrument [Line Items]                  
Income Taxes Receivable $ 17,800,000     $ 17,800,000   $ 17,800,000      
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%   0.60%      
Financing from French government agencies related to various government incentive programs (1) [1] $ 12,500,000     $ 12,500,000   $ 12,500,000   $ 15,100,000  
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] 1,500,000     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%  
Line of Credit Facility, Current Borrowing Capacity 0     0   0   $ 0  
Letters of Credit Outstanding, Amount 300,000     300,000   300,000   300,000  
Revolving Credit Facility [Member] | Silicon Valley Bank [Member]                  
Debt Instrument [Line Items]                  
Letters of Credit Outstanding, Amount $ 2,300,000     $ 2,300,000   $ 2,300,000      
Convertible Note due 2022                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage 4.375%     4.375% 4.375% 4.375%      
Principal amount $ 37,707,000     $ 37,707,000   $ 37,707,000      
Common stock, par value | $ / shares $ 0.001     $ 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   $ 5.75      
Carrying amount of equity component $ 8,300,000     $ 8,300,000   $ 8,300,000      
Fair Value of Liability Component - Convertible Notes 36,000,000.0     36,000,000.0   36,000,000.0      
Debt Instrument, Unamortized Discount 1,681,000     $ 1,681,000   $ 1,681,000      
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        
Debt Instrument, Convertible, Conversion Ratio         115.5001        
Debt Conversion, Converted Instrument, Amount         $ 1,000        
Debt Instrument, Convertible, Conversion Price | $ / shares         $ 8.66        
Carrying amount of equity component         $ 24,900,000        
Debt Instrument, Unamortized Discount $ 21,517,000     $ 21,517,000   $ 21,517,000   23,652,000  
Convertible Note due 2020                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage 4.00%     4.00%   4.00%     4.00%
Principal amount $ 8,053,000     $ 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
Carrying amount of equity component                 $ 26,100,000
Debt Instrument, Unamortized Discount 177,000     177,000   177,000   $ 2,151,000  
Debt Instrument, Repurchase Amount         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 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  
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   $ 8,100,000      
Loss on debt extinguishment         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 EURIBOR Rate, Term           1 month      
One Month LIBOR [Member] | Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member]                  
Debt Instrument [Line Items]                  
Adjusted 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 EURIBOR Rate, Term               2 months  
Three Month LIBOR [Member] | Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member]                  
Debt Instrument [Line Items]                  
Adjusted EURIBOR Rate, Term               3 months  
[1] As of June 26, 2020 and December 31, 2019, loans backed by French R&D tax credit receivables were $12.5 million and $15.1 million, respectively. As of June 26, 2020, the French Subsidiary had an aggregate of $17.8 million of R&D tax credit receivables from the French government from 2021 through 2023. 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 June 26, 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.