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Available-for-Sale Securities (Tables) | 9 Months Ended
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Sep. 30, 2012
Available-for-Sale Securities |
Schedule of amortized cost and estimated fair values for available-for-sale securities |
|  | September 30, 2012 |
(in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
U.S. government securities |  | $ | 30,233 |  | $ | 9 |  | $ | — |  | $ | 30,242 |
U.S. government agencies |  | 107,073 |  | 69 |  | (1 | ) | 107,141 |
U.S. corporate notes |  | 98,599 |  | 45 |  | (7 | ) | 98,637 |
U.S. commercial paper |  | 37,336 |  | 1 |  | — |  | 37,337 |
Money market funds |  | 85,634 |  | — |  | — |  | 85,634 |
Total |  | $ | 358,875 |  | $ | 124 |  | $ | (8 | ) | $ | 358,991 |
|  | December 31, 2011 |
(in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
U.S. government securities |  | $ | 66,150 |  | $ | 24 |  | $ | — |  | $ | 66,174 |
U.S. government agencies |  | 93,183 |  | 9 |  | (17 | ) | 93,175 |
U.S. corporate notes |  | 2,707 |  | — |  | (2 | ) | 2,705 |
U.S. commercial paper |  | 34,973 |  | 3 |  | — |  | 34,976 |
Money market funds |  | 38,721 |  | — |  | — |  | 38,721 |
Total |  | $ | 235,734 |  | $ | 36 |  | $ | (19 | ) | $ | 235,751 |
Schedule of classification of the available-for-sale debt securities |
(in thousands) |  | September 30, 2012 |  | December 31, 2011 |
Cash and cash equivalents |  | $ | 107,987 |  | $ | 38,721 |
Short-term investments |  | 161,209 |  | 196,137 |
Long-term marketable securities |  | 88,962 |  | — |
Restricted cash |  | 833 |  | 893 |
Total |  | $ | 358,991 |  | $ | 235,751 |

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- Definition Tabular disclosure of the classification of available-for-sale securities into various debt securities. + References No definition available. + Details
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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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