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Cash and Investments | 12 Months Ended
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Dec. 27, 2014
Investments, Debt and Equity Securities [Abstract] |
Cash and Investments | Cash and Investments The following table presents cash, cash equivalents, and available-for-sale investments as of the following dates (in thousands):
| 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 |
| December 28, 2013
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Market Value
Cash | $ | 43,139 |  |  | $ | — |  |  | $ | — |  |  | $ | 43,139 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 876 |  |  | — |  |  | — |  |  | 876 |
Commercial paper | 750 |  |  | — |  |  | — |  |  | 750 |
Marketable securities: |  |  |  |  |  |  |
U.S. Treasury Securities | 5,036 |  |  | — |  |  | — |  |  | 5,036 |
U.S. Government agency securities | 11,980 |  |  | 4 |  |  | (4 | ) |  | 11,980 |
Municipal securities | 9,756 |  |  | 11 |  |  | (4 | ) |  | 9,763 |
Corporate debt securities | 21,316 |  |  | 7 |  |  | (5 | ) |  | 21,318 |
Total cash, cash equivalents, and marketable securities | $ | 92,853 |  |  | $ | 22 |  |  | $ | (13 | ) |  | $ | 92,862 |
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 December 27, 2014 and December 28, 2013, 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 fiscal years ended December 27, 2014, December 28, 2013 and December 29, 2012 were insignificant and no marketable securities had other than temporary impairment. All marketable securities as of December 27, 2014 and December 28, 2013, had maturity dates of less than two years and were not invested in foreign entities.

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