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Fair Value Measurements (Details) (Assets and liabilities measured on a recurring basis, USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Level 1 | U.S. treasuries |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | $ 130,977 | $ 278,698
Level 2 |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Derivative instrument | 907 | 248
Level 2 | Corporate debt |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | 77,601 |
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 | 61,013 | 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 | 11,947 |
Level 3 |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Contingent consideration | (29,368) |
Fair Value |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Derivative instrument | 907 | 248
Contingent consideration | (29,368) |
Fair Value | U.S. treasuries |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | 130,977 | 278,698
Fair Value | Corporate debt |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | 77,601 |
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 | 61,013 | 123,054
Fair Value | Commercial paper |  |
Major categories of assets and liabilities measured on a recurring basis, at fair value |  |
Cash equivalents and short-term investments | $ 11,947 |

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: 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 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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