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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2013 | Jun. 30, 2013 Item | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Money market funds | Dec. 31, 2012 Money market funds | Jun. 30, 2013 Corporate notes, bonds and commercial paper | Dec. 31, 2012 Corporate notes, bonds and commercial paper | Jun. 30, 2013 Recurring basis Total | Dec. 31, 2012 Recurring basis Total | Jun. 30, 2013 Recurring basis Total Money market funds | Dec. 31, 2012 Recurring basis Total Money market funds | Jun. 30, 2013 Recurring basis Total Corporate notes, bonds and commercial paper | Dec. 31, 2012 Recurring basis Total Corporate notes, bonds and commercial paper | Jun. 30, 2013 Recurring basis Quoted Market Prices in Active Markets (Level 1) | Dec. 31, 2012 Recurring basis Quoted Market Prices in Active Markets (Level 1) | Jun. 30, 2013 Recurring basis Quoted Market Prices in Active Markets (Level 1) Money market funds | Dec. 31, 2012 Recurring basis Quoted Market Prices in Active Markets (Level 1) Money market funds | Jun. 30, 2013 Recurring basis Quoted Market Prices in Active Markets (Level 1) Corporate notes, bonds and commercial paper | Dec. 31, 2012 Recurring basis Quoted Market Prices in Active Markets (Level 1) Corporate notes, bonds and commercial paper | Jun. 30, 2013 Recurring basis Significant Other Observable Inputs (Level 2) | Dec. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2) | Jun. 30, 2013 Recurring basis Significant Other Observable Inputs (Level 2) Money market funds | Dec. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Money market funds | Jun. 30, 2013 Recurring basis Significant Other Observable Inputs (Level 2) Corporate notes, bonds and commercial paper | Dec. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Corporate notes, bonds and commercial paper | Jun. 30, 2013 Recurring basis Significant Unobservable Inputs (Level 3) | Dec. 31, 2012 Recurring basis Significant Unobservable Inputs (Level 3) | Jun. 30, 2013 Recurring basis Significant Unobservable Inputs (Level 3) Money market funds | Dec. 31, 2012 Recurring basis Significant Unobservable Inputs (Level 3) Money market funds | Jun. 30, 2013 Recurring basis Significant Unobservable Inputs (Level 3) Corporate notes, bonds and commercial paper | Dec. 31, 2012 Recurring basis Significant Unobservable Inputs (Level 3) Corporate notes, bonds and commercial paper | Mar. 31, 2013 Nonrecurring basis
Financial assets subject to fair value measurements and the necessary disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pricing sources |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total available-for-sale securities | $ 193,724 | $ 193,724 |  | $ 183,915 | $ 134,860 | $ 126,570 | $ 58,864 | $ 57,345 | $ 193,724 | $ 183,915 | $ 134,860 | $ 126,570 | $ 58,864 | $ 57,345 | $ 134,860 | $ 126,570 | $ 134,860 | $ 126,570 | $ 0 | $ 0 | $ 58,864 | $ 57,345 | $ 0 | $ 0 | $ 58,864 | $ 57,345 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |
Investment in non-marketable equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000
Impairment of investment in non-marketable equity security | $ 1,400 | $ 1,400 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16B -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. + Details
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