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Cash and Investments (Tables) | 12 Months Ended
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Dec. 30, 2017
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 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 |
|  | December 31, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 43,604 |  |  | $ | — |  |  | $ | — |  |  | $ | 43,604 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 959 |  |  |  | — |  |  |  | — |  |  |  | 959 |
Commercial paper and corporate debt securities |  |  | 2,499 |  |  |  | — |  |  |  | — |  |  |  | 2,499 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | 5,667 |  |  |  | — |  |  |  | — |  |  |  | 5,667 |
U.S. Government agency securities |  |  | 11,412 |  |  |  | — |  |  |  | (7 | ) |  |  | 11,405 |
Certificates of deposits |  |  | 23,000 |  |  |  | 19 |  |  |  | — |  |  |  | 23,019 |
Commercial paper |  |  | 22,402 |  |  |  | — |  |  |  | — |  |  |  | 22,402 |
Corporate debt securities |  |  | 14,194 |  |  |  | — |  |  |  | (6 | ) |  |  | 14,188 |
Municipal securities |  |  | 756 |  |  |  | — |  |  |  | (1 | ) |  |  | 755 |
Asset-backed securities |  |  | 5,466 |  |  |  | — |  |  |  | (3 | ) |  |  | 5,463 |
Total cash, cash equivalents, and marketable securities |  | $ | 129,959 |  |  | $ | 19 |  |  | $ | (17 | ) |  | $ | 129,961 |

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