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Cash and Investments (Tables) | 12 Months Ended
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Dec. 29, 2018
Investments Debt And Equity Securities [Abstract] |
Cash, Cash Equivalents and Available-for-Sale Investments | The following table presents cash, cash equivalents, and available-for-sale investments as of the following dates (in thousands):
|  | December 29, 2018 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 108,845 |  |  | $ | — |  |  | $ | — |  |  | $ | 108,845 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 113 |  |  |  | — |  |  |  | — |  |  |  | 113 |
Commercial paper |  |  | 1,993 |  |  |  | — |  |  |  | — |  |  |  | 1,993 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposits |  |  | 9,500 |  |  |  | — |  |  |  | (3 | ) |  |  | 9,497 |
Commercial paper |  |  | 7,933 |  |  |  | — |  |  |  | (1 | ) |  |  | 7,932 |
Corporate debt securities |  |  | 15,788 |  |  |  | — |  |  |  | (58 | ) |  |  | 15,730 |
Asset-backed securities |  |  | 7,706 |  |  |  | — |  |  |  | (24 | ) |  |  | 7,682 |
Total cash, cash equivalents, and marketable securities |  | $ | 151,878 |  |  | $ | — |  |  | $ | (86 | ) |  | $ | 151,792 |
|  | 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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