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Fair Value Measurements (Details) (Assets and liabilities measured on a recurring basis, USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Level 1 |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Total | $ 180,161 | $ 278,698
Level 1 | United States treasuries |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | 180,161 | 278,698
Level 2 |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Total | 149,327 | 123,054
Level 2 | Commercial paper |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | 11,943 |
Level 2 | Corporate bonds |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | 74,721 |
Level 2 | Government agency securities |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | 62,663 | 123,054
Fair Value |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Total | 329,488 | 401,752
Fair Value | United States treasuries |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | 180,161 | 278,698
Fair Value | Commercial paper |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | 11,943 |
Fair Value | Corporate bonds |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | 74,721 |
Fair Value | Government agency securities |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | $ 62,663 | $ 123,054

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -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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