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Available-for-sale debt securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Available-for-sale debt securities |
Schedule of investments in available-for-sale debt securities | As of September 30, 2018, the Company has the following investments in available-for-sale debt securities (in thousands):
|  |  |  |  |  | Gross |  | Gross |  | Aggregate |
|  |  |  | Amortized |  | unrealized |  | unrealized |  | estimated fair |
|  | Maturity |  | cost |  | gains |  | losses |  | value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | 3 months to 1 year |  | $ | 82,717 |  | $ | — |  | $ | (49 | ) | $ | 82,668 |
Commercial paper |  | 3 months to 1 year |  | 1,984 |  |  |  | — |  | 1,984 |
|  |  |  | $ | 84,701 |  | $ | — |  | $ | (49 | ) | $ | 84,652 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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