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Cash and Investments (Tables) | 9 Months Ended
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Sep. 29, 2018
Investments Debt And Equity Securities [Abstract] |
Cash, Cash Equivalents and Available-for-Sale Investments | The following tables present cash, cash equivalents, and available-for-sale investments as of the following dates (in thousands):
|  | September 29, 2018 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 94,419 |  |  | $ | — |  |  | $ | — |  |  | $ | 94,419 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 1,684 |  |  |  | — |  |  |  | — |  |  |  | 1,684 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 14,496 |  |  |  | 6 |  |  |  | — |  |  |  | 14,502 |
Commercial paper |  |  | 11,185 |  |  |  | — |  |  |  | — |  |  |  | 11,185 |
Corporate debt securities |  |  | 37,038 |  |  |  | — |  |  |  | (88 | ) |  |  | 36,950 |
Asset-backed securities |  |  | 14,224 |  |  |  | — |  |  |  | (26 | ) |  |  | 14,198 |
Total cash, cash equivalents, and marketable securities |  | $ | 173,046 |  |  | $ | 6 |  |  | $ | (114 | ) |  | $ | 172,938 |
|  | December 30, 2017 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 34,643 |  |  | $ | — |  |  | $ | — |  |  | $ | 34,643 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 256 |  |  |  | — |  |  |  | — |  |  |  | 256 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency securities |  |  | 1,500 |  |  |  | — |  |  |  | (5 | ) |  |  | 1,495 |
Certificates of deposits |  |  | 14,498 |  |  |  | — |  |  |  | (1 | ) |  |  | 14,497 |
Commercial paper |  |  | 7,952 |  |  |  | — |  |  |  | (3 | ) |  |  | 7,949 |
Corporate debt securities |  |  | 48,073 |  |  |  | — |  |  |  | (105 | ) |  |  | 47,968 |
Asset-backed securities |  |  | 10,240 |  |  |  | — |  |  |  | (19 | ) |  |  | 10,221 |
Total cash, cash equivalents, and marketable securities |  | $ | 117,162 |  |  | $ | — |  |  | $ | (133 | ) |  | $ | 117,029 |

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