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Cash and Investments (Notes) | 9 Months Ended
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Sep. 28, 2013
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 September 28, 2013, and December 29, 2012 (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Market Value
September 28, 2013 |  |  |  |  |  |  |
Cash | $ | 43,085 |  |  | $ | — |  |  | $ | — |  |  | $ | 43,085 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 748 |  |  | — |  |  | — |  |  | 748 |
Marketable securities: |  |  |  |  |  |  |
Commercial paper | 950 |  |  | — |  |  | — |  |  | 950 |
U.S. Treasury securities | 5,048 |  |  | — |  |  | — |  |  | 5,048 |
U.S. Government agency securities | 15,685 |  |  | 8 |  |  | (4 | ) |  | 15,689 |
Municipal securities | 8,546 |  |  | 11 |  |  | — |  |  | 8,557 |
Corporate debt securities | 18,803 |  |  | 16 |  |  | (6 | ) |  | 18,813 |
Total cash, cash equivalents, and short-term investments | $ | 92,865 |  |  | $ | 35 |  |  | $ | (10 | ) |  | $ | 92,890 |
December 29, 2012 |  |  |  |  |  |  |
Cash | $ | 60,206 |  |  | $ | — |  |  | $ | — |  |  | $ | 60,206 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 109 |  |  | — |  |  | — |  |  | 109 |
Commercial paper | 2,600 |  |  | — |  |  | — |  |  | 2,600 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | 3,199 |  |  | — |  |  | — |  |  | 3,199 |
U.S. Treasury Securities | 4,996 |  |  | 1 |  |  | — |  |  | 4,997 |
U.S. Government agency securities | 15,567 |  |  | 6 |  |  | (2 | ) |  | 15,571 |
Municipal securities | 5,396 |  |  | 1 |  |  | (1 | ) |  | 5,396 |
Corporate debt securities | 17,837 |  |  | 2 |  |  | (9 | ) |  | 17,830 |
Total cash, cash equivalents, and short-term investments | $ | 109,910 |  |  | $ | 10 |  |  | $ | (12 | ) |  | $ | 109,908 |
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 28, 2013, and December 29, 2012, 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 month periods ended September 28, 2013, and September 29, 2012, were insignificant and no marketable securities had other than temporary impairment. All marketable securities as of September 28, 2013, and December 29, 2012, had maturity dates of less than two years and none were invested in foreign entities.

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- Definition The entire disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + References No definition available. + Details
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