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Marketable Securities (Tables) | 12 Months Ended
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Dec. 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):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
December 31, 2019 |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 30,496 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,496 |
Commercial paper securities | 2,998 |  |  | 1 |  |  | — |  |  | 2,999 |
Total | 33,494 |  |  | 1 |  |  | — |  |  | 33,495 |
Available-for-sale securities: |  |  |  |  |  |  |
Commercial paper securities | 155,230 |  |  | 145 |  |  | (7) |  |  | 155,368 |
Corporate debt securities | 94,905 |  |  | 115 |  |  | (3) |  |  | 95,017 |
U.S. government-sponsored entity debt securities | 53,411 |  |  | 91 |  |  | (9) |  |  | 53,493 |
Total | 303,546 |  |  | 351 |  |  | (19) |  |  | 303,878 |
Total cash equivalents and available-for-sale securities | $ | 337,040 |  |  | $ | 352 |  |  | $ | (19) |  |  | $ | 337,373 |
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 |
The fair value of investments available-for-sale by contractual maturity were as follows (in thousands):
| December 31, |  |
| 2019 |  |  | 2018
Maturing in one year or less | $ | 282,046 |  |  |  | $ | 259,715 |
Maturing after one year through five years | 21,832 |  |  |  | — |
Total investments available-for-sale | $ | 303,878 |  |  |  | $ | 259,715 |

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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