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Available-for-sale Securities (Tables) | 3 Months Ended
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Mar. 31, 2014
Summary of Available for Sale Securities | The following is a summary of available-for-sale securities at March 31, 2014 (in thousands):
|  | March 31, 2014 |
|  | Carrying Value |  |  | Gross Unrealized Gain |  |  | Fair Value |
Money market funds |  | $ | 9,648 |  |  | $ | 0 |  |  | $ | 9,648 |
Corporate debt securities |  |  | 20,243 |  |  |  | 8 |  |  |  | 20,251 |
United States government agency securities |  |  | 4,012 |  |  |  | 0 |  |  |  | 4,012 |
Total available-for-sale securities |  | $ | 33,903 |  |  | $ | 8 |  |  | $ | 33,911 |
The following is a summary of available-for-sale securities at December 31, 2013 (in thousands):
|  | December 31, 2013 |
|  | Carrying Value |  |  | Gross Unrealized Gain |  |  | Fair Value |
Money market funds |  | $ | 8,650 |  |  | $ | 0 |  |  | $ | 8,650 |
Corporate debt securities |  |  | 23,165 |  |  |  | 8 |  |  |  | 23,173 |
United States government agency securities |  |  | 5,019 |  |  |  | (1 | ) |  |  | 5,018 |
Total available-for-sale securities |  | $ | 36,834 |  |  | $ | 7 |  |  | $ | 36,841 |
Available for Sale Securities by Original Contractual Maturity | Available-for-sale securities at March 31, 2014 and December 31, 2013 consisted of the following by original contractual maturity (in thousands):
|  | March 31, 2014 |  |  | December 31, 2013 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Due in one year or less |  | $ | 33,903 |  |  | $ | 33,911 |  |  | $ | 30,700 |  |  | $ | 30,701 |
Due greater than one year and less than three years |  |  | 0 |  |  |  | 0 |  |  |  | 6,134 |  |  |  | 6,140 |
Total cash equivalents and short-term investments |  | $ | 33,903 |  |  | $ | 33,911 |  |  | $ | 36,834 |  |  | $ | 36,841 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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