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Cash Equivalents and Investments (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments Debt And Equity Securities [Abstract] |
Summary of Available-for-sale Securities | The following table summarizes the available‑for‑sale securities (in thousands):
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
September 30, 2018 (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 9,850 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,850 |
Corporate notes |  |  | 31,749 |  |  |  | — |  |  |  | (55 | ) |  |  | 31,694 |
Commercial paper |  |  | 83,744 |  |  |  | — |  |  |  | — |  |  |  | 83,744 |
Asset backed securities |  |  | 12,226 |  |  |  | — |  |  |  | (28 | ) |  |  | 12,198 |
Government notes |  |  | 12,448 |  |  |  | — |  |  |  | (18 | ) |  |  | 12,430 |
Total |  | $ | 150,017 |  |  | $ | — |  |  | $ | (101 | ) |  | $ | 149,916 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 8,685 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,685 |
Corporate notes |  |  | 46,133 |  |  |  | — |  |  |  | (35 | ) |  |  | 46,098 |
Government notes |  |  | 6,191 |  |  |  | — |  |  |  | (16 | ) |  |  | 6,175 |
Total |  | $ | 61,009 |  |  | $ | — |  |  | $ | (51 | ) |  | $ | 60,958 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration