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Cash and Investments (Tables) | 9 Months Ended
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Sep. 28, 2019
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 28, 2019 |  |  | December 29, 2018 |
| Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash | $ | 34,862 |  |  | $ | — |  |  | $ | — |  |  | $ | 34,862 |  |  | $ | 108,845 |  |  | $ | — |  |  | $ | — |  |  | $ | 108,845 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | 9,162 |  |  |  | — |  |  |  | — |  |  |  | 9,162 |  |  |  | 113 |  |  |  | — |  |  |  | — |  |  |  | 113 |
Commercial paper |  | 5,985 |  |  |  | — |  |  |  | — |  |  |  | 5,985 |  |  |  | 1,993 |  |  |  | — |  |  |  | — |  |  |  | 1,993 |
Certificates of deposit |  | 1,000 |  |  |  | — |  |  |  | — |  |  |  | 1,000 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | 29,003 |  |  |  | 4 |  |  |  | — |  |  |  | 29,007 |  |  |  | 9,500 |  |  |  | — |  |  |  | (3 | ) |  |  | 9,497 |
Commercial paper |  | 16,760 |  |  |  | — |  |  |  | (1 | ) |  |  | 16,759 |  |  |  | 7,933 |  |  |  | — |  |  |  | (1 | ) |  |  | 7,932 |
Corporate debt securities |  | 36,894 |  |  |  | 33 |  |  |  | — |  |  |  | 36,927 |  |  |  | 15,788 |  |  |  | — |  |  |  | (58 | ) |  |  | 15,730 |
Asset-backed securities |  | 10,393 |  |  |  | 15 |  |  |  | — |  |  |  | 10,408 |  |  |  | 7,706 |  |  |  | — |  |  |  | (24 | ) |  |  | 7,682 |
Total cash, cash equivalents, and marketable securities | $ | 144,059 |  |  | $ | 52 |  |  | $ | (1 | ) |  | $ | 144,110 |  |  | $ | 151,878 |  |  | $ | — |  |  | $ | (86 | ) |  | $ | 151,792 |

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