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Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2015
Fair Value of Financial Instruments [Abstract] |
Summary of Fair Value Measurement Financial Asset and Liabilities | Financial assets and liabilities subject to fair value measurements were as follows (in thousands):
| Fair Value Measurements at September 30, 2015 |
|  |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |
| Total |  | Level 1 |  | Level 2 |  | Level 3 |
Assets: |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 114,721 |  |  | $ | 114,721 |  |  | $ | — |  |  | $ | — |
Money market funds |  |  | 251,046 |  |  |  | 251,046 |  |  |  | — |  |  |  | — |
Total Assets |  | $ | 365,767 |  |  | $ | 365,767 |  |  | $ | — |  |  | $ | — |
| Fair Value Measurements at December 31, 2014 |
|  |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs |
| Total |  | Level 1 |  | Level 2 |  | Level 3 |
Assets: |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 131,545 |  |  | $ | 131,545 |  |  | $ | — |  |  | $ | — |
Money market funds |  |  | 26,046 |  |  |  | 26,046 |  |  |  | — |  |  |  | — |
Restricted cash |  |  | 300 |  |  |  | 300 |  |  |  | — |  |  |  | — |
Total Assets |  | $ | 157,891 |  |  | $ | 157,891 |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a,b,bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL7498348-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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