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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments Debt And Equity Securities [Abstract] |
Summary of Cash Equivalents and Available-for-Sale Securities | The table below summarizes the Company’s cash equivalents and available-for-sale securities (in thousands):
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Fair Value |
March 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 15,233 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,233 |
Commercial paper securities |  |  | 4,990 |  |  |  | — |  |  |  | — |  |  |  | 4,990 |
Total |  |  | 20,223 |  |  |  | — |  |  |  | — |  |  |  | 20,223 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper securities |  |  | 180,380 |  |  |  | 19 |  |  |  | — |  |  |  | 180,399 |
Corporate debt securities |  |  | 70,973 |  |  |  | — |  |  |  | (25 | ) |  |  | 70,948 |
U.S. government-sponsored entity debt securities |  |  | 18,681 |  |  |  | — |  |  |  | — |  |  |  | 18,681 |
Total |  |  | 270,034 |  |  |  | 19 |  |  |  | (25 | ) |  |  | 270,028 |
Total cash equivalents and available-for-sale securities |  | $ | 290,257 |  |  | $ | 19 |  |  | $ | (25 | ) |  | $ | 290,251 |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 103,291 |  |  | $ | — |  |  | $ | — |  |  | $ | 103,291 |
Total |  |  | 103,291 |  |  |  | — |  |  |  | — |  |  |  | 103,291 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper securities |  |  | 177,353 |  |  |  | — |  |  |  | (129 | ) |  |  | 177,224 |
Corporate debt securities |  |  | 63,981 |  |  |  | — |  |  |  | (111 | ) |  |  | 63,870 |
U.S. government-sponsored entity debt securities |  |  | 18,640 |  |  |  | — |  |  |  | (19 | ) |  |  | 18,621 |
Total |  |  | 259,974 |  |  |  | — |  |  |  | (259 | ) |  |  | 259,715 |
Total cash equivalents and available-for-sale securities |  | $ | 363,265 |  |  |  | — |  |  | $ | (259 | ) |  | $ | 363,006 |

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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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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration