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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Summary of Assets and Liabilities Carried at Fair Value | A summary of the assets and liabilities carried at fair value in accordance with the hierarchy defined above is as follows (in thousands):
|  | Fair Value Measurements Using |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
September 30, 2018 (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 9,850 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,850 |
Corporate notes |  |  | — |  |  |  | 31,694 |  |  |  | — |  |  |  | 31,694 |
Commercial paper |  |  | — |  |  |  | 83,744 |  |  |  | — |  |  |  | 83,744 |
Asset backed securities |  |  | — |  |  |  | 12,198 |  |  |  | — |  |  |  | 12,198 |
Government notes |  |  | — |  |  |  | 12,430 |  |  |  | — |  |  |  | 12,430 |
Total assets |  | $ | 9,850 |  |  | $ | 140,066 |  |  |  | — |  |  | $ | 149,916 |
|  | Fair Value Measurements Using |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 8,685 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,685 |
Corporate notes |  |  | 5,103 |  |  |  | 40,995 |  |  |  | — |  |  |  | 46,098 |
Government notes |  |  | 6,175 |  |  |  | — |  |  |  | — |  |  |  | 6,175 |
Total assets |  | $ | 19,963 |  |  | $ | 40,995 |  |  | $ | — |  |  | $ | 60,958 |

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- Definition Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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