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Cash, Cash Equivalents and Marketable Securities | 12 Months Ended
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Dec. 31, 2012
Cash, Cash Equivalents and Marketable Securities | 4. Cash, Cash Equivalents and Marketable Securities The following is a summary of cash, cash equivalents and marketable securities as of December 31, 2012, and 2011 (in thousands):
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 1,542 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,542 |
Money market funds |  |  | 3,140 |  |  |  | — |  |  |  | — |  |  |  | 3,140 |
U.S. government agency securities |  |  | 715 |  |  |  | — |  |  |  | — |  |  |  | 715 |
Municipal securities |  |  | 2,202 |  |  |  | — |  |  |  | — |  |  |  | 2,202 |
Total cash and cash equivalents |  |  | 7,599 |  |  |  | — |  |  |  | — |  |  |  | 7,599 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency securities |  |  | 116,986 |  |  |  | 46 |  |  |  | (1 | ) |  |  | 117,031 |
U.S. treasury securities |  |  | 500 |  |  |  | — |  |  |  | — |  |  |  | 500 |
Total marketable securities available-for-sale |  |  | 117,486 |  |  |  | 46 |  |  |  | (1 | ) |  |  | 117,531 |
Total cash, cash equivalents and marketable securities |  | $ | 125,085 |  |  | $ | 46 |  |  | $ | (1 | ) |  | $ | 125,130 |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 2,290 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,290 |
Money market funds |  |  | 17,171 |  |  |  | — |  |  |  | — |  |  |  | 17,171 |
U.S. government agency securities |  |  | 2,013 |  |  |  | — |  |  |  | — |  |  |  | 2,013 |
U.S. treasury securities |  |  | 7,425 |  |  |  | — |  |  |  | — |  |  |  | 7,425 |
Corporate debt securities, secured by the U.S. government |  |  | 3,044 |  |  |  | — |  |  |  | (2 | ) |  |  | 3,042 |
Total cash and cash equivalents |  |  | 31,943 |  |  |  | — |  |  |  | (2 | ) |  |  | 31,941 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency securities |  |  | 26,488 |  |  |  | — |  |  |  | (5 | ) |  |  | 26,483 |
Corporate debt securities, secured by the U.S. government |  |  | 55,533 |  |  |  | 9 |  |  |  | (5 | ) |  |  | 55,537 |
Total marketable securities available-for-sale |  |  | 82,021 |  |  |  | 9 |  |  |  | (10 | ) |  |  | 82,020 |
Total cash, cash equivalents and marketable securities |  | $ | 113,964 |  |  | $ | 9 |  |  | $ | (12 | ) |  | $ | 113,961 |
The maturities of our marketable securities available-for-sale are as follows (in thousands)
|  | December 31, 2012 |
|  | Amortized Cost |  |  | Estimated Fair Value |
Mature in one year or less |  | $ | 79,743 |  |  | $ | 79,772 |
Mature after one year through two years |  |  | 37,743 |  |  |  | 37,759 |
|  | $ | 117,486 |  |  | $ | 117,531 |
We invest in short-term money market funds, U.S. government agency securities, U.S treasury securities, municipal securities and corporate obligations secured by the Federal Deposit Insurance Corporation through the Temporary Liquidity Guarantee Program. There were no realized gains or losses from the sale of marketable securities in the years ended December 31, 2012, 2011 and 2010. All of our investments are classified as short-term and available-for-sale, as we may not hold our investments until maturity.

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References No definition available. + Details
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