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Cash and Investments (Tables) | 3 Months Ended
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Apr. 01, 2017
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):
|  | April 1, 2017 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 45,559 |  |  | $ | — |  |  | $ | — |  |  | $ | 45,559 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 858 |  |  |  | — |  |  |  | — |  |  |  | 858 |
Commercial paper and corporate debt securities |  |  | 1,000 |  |  |  | — |  |  |  | — |  |  |  | 1,000 |
Marketable securities: |  |  |  |  |  |  | — |  |  |  | — |  |  |  |  |
U.S. Treasury securities |  |  | 3,006 |  |  |  | — |  |  |  | (1 | ) |  |  | 3,005 |
U.S. Government agency securities |  |  | 8,710 |  |  |  | — |  |  |  | (6 | ) |  |  | 8,704 |
Certificate of deposits |  |  | 21,500 |  |  |  | 5 |  |  |  | — |  |  |  | 21,505 |
Commercial paper |  |  | 22,325 |  |  |  | — |  |  |  | (2 | ) |  |  | 22,323 |
Corporate debt securities |  |  | 25,875 |  |  |  | — |  |  |  | (6 | ) |  |  | 25,869 |
Asset-backed securities |  |  | 3,274 |  |  |  | — |  |  |  | (1 | ) |  |  | 3,273 |
Total cash, cash equivalents, and marketable securities |  | $ | 132,107 |  |  | $ | 5 |  |  | $ | (16 | ) |  | $ | 132,096 |
|  | 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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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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