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Convertible Notes, Other Debts And Capital Leases - Additional Information (Detail) $ / shares in Units, shares in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 14, 2015 shares | Sep. 28, 2018 USD ($) $ / shares | Sep. 28, 2018 USD ($) $ / shares | Dec. 31, 2015 USD ($) day $ / shares | Dec. 31, 2017 USD ($) | Sep. 29, 2017 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 4.00% |  |
Debt Instrument, Face Amount |  |  | $ 128,250,000 | $ 128,250,000 | $ 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 | $ 5.75 | $ 5.75 |  | $ 5.75
Debt Issuance Cost, Gross, Noncurrent |  |  |  |  | $ 4,100,000 |  |
Percentage Of Principal Amount Of Convertible Notes Is Equal To Repurchase Price |  |  |  |  | 100.00% |  |
Carrying amount of equity component |  |  | $ 26,062,000 | $ 26,062,000 |  | 26,062,000 |
Financing from French government agencies related to various government incentive programs (1) | [1] |  | 19,443,000 | 19,443,000 |  | 20,565,000 |
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% |  |
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% |  |
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] |  |  |  |  |  |  |
Proceeds from Convertible Debt |  |  |  |  | $ 74,200,000 |  |
Income Taxes Receivable |  |  | $ 25,600,000 | $ 25,600,000 |  |  |
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] |  | $ 17,000,000 | $ 17,000,000 |  | $ 17,700,000 |
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] |  | $ 2,400,000 | 2,400,000 |  |  |
Revolving Credit Facility [Member] | Silicon Valley Bank [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Minimum Net Worth Required for Compliance |  |  | 20,000,000 | 20,000,000 |  |  |
Minimum Liquidity Amount |  |  | 10,000,000 | 10,000,000 |  |  |
Letters of Credit Outstanding, Amount |  |  | 2,700,000 | 2,700,000 |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  | $ 0 | $ 0 |  |  |
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility [Member] | Silicon Valley Bank [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.25% |  |  |
Euribor | Loans Backed By French Research And Development Tax Credit Receivables [Member] | TVN [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Adjusted EURIBOR Rate, Term |  |  | 1 month |  |  |  |
Not Comply with Liquidity Requirement [Member] | Prime Rate | Revolving Credit Facility [Member] | Silicon Valley Bank [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.25% |  |  |
Maximum [Member] | Revolving Credit Facility [Member] | Silicon Valley Bank [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 15,000,000 | $ 15,000,000 |  |  |
Outstanding Borrowing Limit Based on Eligible Receivables, Percentage |  |  | 85.00% | 85.00% |  |  |
Minimum [Member] | Revolving Credit Facility [Member] | Silicon Valley Bank [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Covenant Ratio of Short Term Asset to Short Term Liabilities |  |  | 110.00% | 110.00% |  |  |
[1] | As of September 28, 2018 and December 31, 2017, loans backed by French R&D tax credit receivables were $17.0 million and $17.7 million, respectively. As of September 28, 2018, the TVN French Subsidiary had an aggregate of $25.6 million of R&D tax credit receivables from the French government from 2018 through 2022. See Note 6, “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 2019 through 2021. The remaining loans of $2.4 million at September 28, 2018, primarily relate to financial support from French government agencies for R&D innovation projects at minimal interest rates, and these loans mature between 2019 through 2025.

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