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Fair Value Measurement (Tables) | 9 Months Ended
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Sep. 30, 2014
Fair Value Disclosures [Abstract] |
Summary of Fair Value Measurements of Cash Equivalents, Available-for-Sale Securities and Contingent Consideration Liability | The fair value measurements of our cash equivalents, available-for-sale marketable securities and contingent consideration liability are identified at the following levels within the fair value hierarchy (in thousands):
| September 30, 2014 |
| Fair Value Measurements |
| Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 7,193 |  |  | $ | 7,193 |  |  | $ | — |  |  | $ | — |
Total |  | 7,193 |  |  |  | 7,193 |  |  |  | — |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper securities |  | 36,247 |  |  |  | — |  |  |  | 36,247 |  |  |  | — |
Corporate debt securities |  | 20,611 |  |  |  | — |  |  |  | 20,611 |  |  |  | — |
U.S. government sponsored entity debt securities |  | 163,410 |  |  |  | — |  |  |  | 163,410 |  |  |  | — |
Total |  | 220,268 |  |  |  | — |  |  |  | 220,268 |  |  |  | — |
Total cash equivalents and marketable securities | $ | 227,461 |  |  | $ | 7,193 |  |  | $ | 220,268 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liability | $ | 1,700 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,700 |
Total | $ | 1,700 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,700 |
| December 31, 2013 |
| Fair Value Measurements |
| Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 6,934 |  |  | $ | 6,934 |  |  | $ | — |  |  | $ | — |
Total |  | 6,934 |  |  |  | 6,934 |  |  |  | — |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entity debt securities |  | 121,290 |  |  |  | — |  |  |  | 121,290 |  |  |  | — |
Total cash equivalents and marketable securities | $ | 128,224 |  |  | $ | 6,934 |  |  | $ | 121,290 |  |  | $ | - |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liability | $ | 1,570 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,570 |
Total | $ | 1,570 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,570 |
Schedule of Changes in Estimated Fair Value of Contingent Consideration Liability | The following sets forth the changes in the estimated fair value for our contingent consideration liability classified as Level 3 (in thousands):
Fair value as of December 31, 2013 | $ | 1,570 |
Change in fair value |  | 130 |
Fair value as of September 30, 2014 | $ | 1,700 |

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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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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + 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 (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: 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 + Details
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