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Balance Sheet Components - Prepaid Expenses And Other Current Assets (Details) - USD ($) $ in Thousands | Jun. 29, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |  |  |  |
Deferred cost of revenue |  | $ 7,688 |  | $ 4,440 |  |
Prepaid maintenance, royalty, rent, property taxes and value added tax |  | 3,753 |  | 3,867 |  |
Contract assets(1) | [1] | 2,704 |  |  |  |
Capitalized commission |  | 1,293 |  |  |  |
Restricted cash(2) |  | 274 | [2] | 530 | [2] | $ 802
French R&D tax credits receivable(3) | [3] | 103 |  | 6,609 |  |
Other |  | 3,562 |  | 3,485 |  |
Prepaid Expense and Other Assets, Current |  | $ 19,377 |  | $ 18,931 |  |
[1] | Contract assets reflect the satisfied performance obligations for which the Company does not yet have an unconditional right to consideration.
[2] | Amounts represent cash collateral security for certain bank guarantees. These restricted funds are invested in bank deposits and cannot be withdrawn from the Company’s accounts without the prior written consent of the applicable secured party.
[3] | The Company’s TVN subsidiary in France (the “TVN French Subsidiary”) participates in the French Crédit d’Impôt Recherche program (the “R&D tax credits”) which allows companies to monetize eligible research expenses. The R&D tax credits can be used to offset against income tax payable to the French government in each of the four years after being incurred, or if not utilized, are recoverable in cash. The amount of R&D tax credits recoverable are subject to audit by the French government. The R&D tax credits receivable at June 29, 2018 were approximately $24.0 million and are expected to be recoverable from 2018 through 2022 with $0.1 million reported as a component of “Prepaid expenses and other current assets” and $23.9 million reported as a component of “Other long-term assets” on the Company’s Condensed Consolidated Balance Sheets.

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