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Short-term Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Short-term Investments [Abstract] |
Short-term Investments | Short-term marketable securities for the periods presented were comprised of the following (in thousands):
| December 31, 2012
Security Type | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government fixed income securities | $ | 87,394 |  |  | $ | 20 |  |  | $ | (411 | ) |  | $ | 87,003 |
Equity securities of certain technology companies | 3,254 |  |  | — |  |  | (782 | ) |  | 2,472 |
Total short-term investments | $ | 90,648 |  |  | $ | 20 |  |  | $ | (1,193 | ) |  | $ | 89,475 |
| December 31, 2011
Security Type | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Equity securities of certain technology companies | 8,427 |  |  | 169 |  |  | (1,999 | ) |  | 6,597 |
Total short-term investments | $ | 8,427 |  |  | $ | 169 |  |  | $ | (1,999 | ) |  | $ | 6,597 |

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