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Fair value measurements (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair value measurements |
Summary of fair value of assets and liabilities on a recurring basis based on fair value measurement criteria | Assets and liabilities measured at fair value on a recurring basis based on Level 1, Level 2, and Level 3 fair value measurement criteria as of September 30, 2018 are as follows (in thousands):
|  |  |  | Fair value measurements using |
|  | September 30, 2018 |  | Level 1 |  | Level 2 |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 82,668 |  | $ | 82,668 |  | $ | — |  | $ | — |
Commercial paper |  | 1,984 |  | — |  | 1,984 |  | — |
|  | $ | 84,652 |  | $ | 82,668 |  | $ | 1,984 |  | $ | — |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: 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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