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Convertible Notes, Other Debts And Finance Lease - Narratives (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 27, 2020 USD ($) $ / shares | Sep. 27, 2019 USD ($) $ / shares | Dec. 31, 2019 USD ($) day $ / shares | Dec. 31, 2015 USD ($) $ / shares
Debt Instrument [Line Items] |  |  |  |  |
Common stock, par value | $ / shares |  | $ 0.001 |  | $ 0.001 |
Financing from French government agencies related to various government incentive programs (1) | [1] | $ 16,160,000 |  | $ 16,566,000 |
Letters of Credit Outstanding, Amount |  | 2,700,000 |  | 2,700,000 |
Convertible notes |  | 1,777,000 |  | 2,410,000 |
TVN [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Income Taxes Receivable |  | $ 23,500,000 |  |  |
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% |  |  |
Financing from French government agencies related to various government incentive programs (1) | [1] | $ 14,700,000 |  | $ 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 |  |  |
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] |  |  |  |  |
Letters of Credit Outstanding, Amount |  | $ 2,200,000 |  |  |
Convertible Note due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.00% | 2.00% |  |
Common stock, par value | $ / shares |  |  | $ 0.001 |  |
Debt Instrument, Face Amount |  | $ 115,500,000 | $ 115,500,000 | $ 115,500,000 |
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 |  |
Convertible Note due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.00% |  |  | 4.00%
Debt Instrument, Face Amount |  | $ 45,785,000 |  | $ 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
Debt Instrument, Repurchase Amount |  |  | 109,600,000 |  |
Carrying amount of equity component |  |  |  |  | $ 26,100,000
Convertible notes |  | $ 1,800,000 |  |  |
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] | Revolving Credit Facility [Member] | JPMORGAN CHASE BANK N.A. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | $ 25,000,000 |
Convertible Debt | Convertible Note due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
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 |  |
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 March 27, 2020 and December 31, 2019, loans backed by French R&D tax credit receivables were $14.7 million and $15.1 million, respectively. As of March 27, 2020, the French Subsidiary had an aggregate of $23.5 million of R&D tax credit receivables from the French government from 2020 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 2020 through 2022. The remaining loans of $1.5 million at March 27, 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.

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