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Cash and Investments | 12 Months Ended
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Dec. 31, 2016
Investments Debt And Equity Securities [Abstract] |
Cash and Investments | Note 4. Cash and Investments The following table presents cash, cash equivalents, and available-for-sale investments as of the following dates (in thousands):
|  | 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 |
|  | December 26, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 32,996 |  |  | $ | — |  |  | $ | — |  |  | $ | 32,996 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 590 |  |  |  | — |  |  |  | — |  |  |  | 590 |
Commercial paper and corporate debt securities |  |  | 4,568 |  |  |  | — |  |  |  | — |  |  |  | 4,568 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | 4,411 |  |  |  | — |  |  |  | (10 | ) |  |  | 4,401 |
U.S. Government agency securities |  |  | 20,193 |  |  |  | 1 |  |  |  | (29 | ) |  |  | 20,165 |
Commercial paper |  |  | 1,884 |  |  |  | — |  |  |  | — |  |  |  | 1,884 |
Corporate debt securities |  |  | 14,759 |  |  |  | — |  |  |  | (23 | ) |  |  | 14,736 |
Municipal securities |  |  | 3,747 |  |  |  | 1 |  |  |  | (3 | ) |  |  | 3,745 |
Total cash, cash equivalents, and marketable securities |  | $ | 83,148 |  |  | $ | 2 |  |  | $ | (65 | ) |  | $ | 83,085 |
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 31, 2016 and December 26, 2015, were available-for-sale and reported at fair value based on the estimated or quoted market prices as of the balance sheet date. Gross realized gain and losses on sale of securities are recorded in other income, net, in our statement of operations. Net realized gains and losses for fiscal 2016, 2015, and 2014 was $0.5 million, $0.2 million and $0.2 million, respectively. 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 31, 2016, and December 26, 2015 were insignificant and no marketable securities had other than temporary impairment. All marketable securities as of December 31, 2016 and December 26, 2015, had maturity dates of less than two years.

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