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Cash and Investments | 9 Months Ended
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Sep. 26, 2015
Investments, Debt and Equity Securities [Abstract] |
Cash and Investments | Cash and Investments The following tables present cash, cash equivalents, and available-for-sale investments as of the following dates (in thousands):
| September 26, 2015
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Market Value
Cash | $ | 34,485 |  |  | $ | — |  |  | $ | — |  |  | $ | 34,485 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 642 |  |  | — |  |  | — |  |  | 642 |
Commercial paper | 6,434 |  |  | — |  |  | — |  |  | 6,434 |
Marketable securities: |  |  |  |  |  |  |
Commercial paper | 1,498 |  |  | — |  |  | — |  |  | 1,498 |
U.S. Government agency securities | 21,668 |  |  | 17 |  |  | (1 | ) |  | 21,684 |
Municipal securities | 3,714 |  |  | 5 |  |  | (1 | ) |  | 3,718 |
Corporate debt securities | 16,168 |  |  | 3 |  |  | (6 | ) |  | 16,165 |
Total cash, cash equivalents, and marketable securities | $ | 84,609 |  |  | $ | 25 |  |  | $ | (8 | ) |  | $ | 84,626 |
| December 27, 2014
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Market Value
Cash | $ | 34,066 |  |  | $ | — |  |  | $ | — |  |  | $ | 34,066 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 610 |  |  | — |  |  | — |  |  | 610 |
Marketable securities: |  |  |  |  |  |  |
Commercial paper | 805 |  |  | — |  |  | — |  |  | 805 |
U.S. Treasury Securities | 2,498 |  |  | — |  |  | (1 | ) |  | 2,497 |
U.S. Government agency securities | 20,556 |  |  | 1 |  |  | (19 | ) |  | 20,538 |
Municipal securities | 3,755 |  |  | 1 |  |  | (7 | ) |  | 3,749 |
Corporate debt securities | 21,722 |  |  | 1 |  |  | (26 | ) |  | 21,697 |
Total cash, cash equivalents, and marketable securities | $ | 84,012 |  |  | $ | 3 |  |  | $ | (53 | ) |  | $ | 83,962 |
Available-for-sale marketable securities, readily convertible to cash, with maturity dates of 90 days or less are classified as cash equivalents, while those with maturity dates greater than 90 days are classified as marketable securities within short-term assets. All marketable securities as of September 26, 2015 and December 27, 2014, were available-for-sale and reported at fair value based on the estimated or quoted market prices as of the balance sheet date. Unrealized gains or losses, net of tax effect, are recorded in accumulated other comprehensive income (loss) within stockholders’ equity. Both the gross unrealized gains and gross unrealized losses for the three and nine months ended September 26, 2015 and September 27, 2014 were insignificant and no marketable securities had other than temporary impairment. All marketable securities as of September 26, 2015 and December 27, 2014, had maturity dates of less than two years and were not invested in foreign entities.

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