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Available-for-sale Securities (Tables) | 3 Months Ended
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Mar. 31, 2013
Summary of Available-for-Sale Securities | The following is a summary of available-for-sale securities at March 31, 2013 (in thousands):
|  | March 31, 2013 |
|  | Carrying Value |  |  | Gross Unrealized Gain |  |  | Fair Value |
Money market funds |  | $ | 53,569 |  |  | $ | 0 |  |  | $ | 53,569 |
Total available-for-sale securities |  | $ | 53,569 |  |  | $ | 0 |  |  | $ | 53,569 |
The following is a summary of available-for-sale securities at December 31, 2012 (in thousands):
|  | December 31, 2012 |
|  | Carrying Value |  |  | Gross Unrealized Gain |  |  | Fair Value |
Money market funds |  | $ | 10,268 |  |  | $ | 0 |  |  | $ | 10,268 |
Total available-for-sale securities |  | $ | 10,268 |  |  | $ | 0 |  |  | $ | 10,268 |
Available-for-Sale Securities Original Contractual Maturity | Available-for-sale securities at March 31, 2013 and December 31, 2012 consisted of the following by original contractual maturity (in thousands):
|  | March 31, 2013 |  |  | December 31, 2012 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Due in one year or less |  | $ | 53,569 |  |  | $ | 53,569 |  |  | $ | 10,268 |  |  | $ | 10,268 |
Due greater than three years and less than five years |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Total cash equivalents and short-term investments |  | $ | 53,569 |  |  | $ | 53,569 |  |  | $ | 10,268 |  |  | $ | 10,268 |

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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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