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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2012
Summary of Significant Accounting Policies Investments in Marketable Securities [Abstract] |
Marketable Securities | The following table presents marketable securities’ cost, gross unrealized gains, gross unrealized losses, and fair value by major security type recorded as short-term investments as of June 30, 2012 and December 31, 2011 (in thousands):
| June 30, 2012
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government fixed income securities | $ | 124,957 |  |  | $ | 22 |  |  | $ | (206 | ) |  | $ | 124,773 |
Equity securities of certain technology companies | 6,410 |  |  | 1,489 |  |  | (176 | ) |  | 7,723 |
Total short-term investments | $ | 131,367 |  |  | $ | 1,511 |  |  | $ | (382 | ) |  | $ | 132,496 |
| December 31, 2011
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government fixed income securities | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
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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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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