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Cash Equivalents and Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
Schedule of Marketable Securities | At June 30, 2020, cash equivalents and marketable securities consisted of the following (in thousands):
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
Money market funds | $ | 378,501 |  |  | $ | — |  |  | $ | — |  |  | $ | 378,501 |
Commercial paper | 8,959 |  |  | — |  |  | — |  |  | 8,959 |
U.S. treasury debt securities | 20,860 |  |  | 190 |  |  | — |  |  | 21,050 |
U.S. corporate debt securities | 75,844 |  |  | 599 |  |  | (1) |  |  | 76,442 |
| $ | 484,164 |  |  | $ | 789 |  |  | $ | (1) |  |  | $ | 484,952 |
Included in cash and cash equivalents | $ | 378,501 |  |  | $ | — |  |  | $ | — |  |  | $ | 378,501 |
Included in marketable securities | $ | 105,663 |  |  | $ | 789 |  |  | $ | (1) |  |  | $ | 106,451 |
At December 31, 2019, cash equivalents and marketable securities consisted of the following (in thousands):
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
Money market funds | $ | 360,471 |  |  | $ | — |  |  | $ | — |  |  | $ | 360,471 |
U.S. treasury debt securities | 10,342 |  |  | 8 |  |  | (1) |  |  | 10,349 |
U.S. corporate debt securities | 95,706 |  |  | 164 |  |  | (5) |  |  | 95,865 |
| $ | 466,519 |  |  | $ | 172 |  |  | $ | (6) |  |  | $ | 466,685 |
Included in cash and cash equivalents | $ | 360,471 |  |  | $ | — |  |  | $ | — |  |  | $ | 360,471 |
Included in marketable securities | $ | 106,048 |  |  | $ | 172 |  |  | $ | (6) |  |  | $ | 106,214 |
Schedule of Cash and Cash Equivalents | At June 30, 2020, cash equivalents and marketable securities consisted of the following (in thousands):
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
Money market funds | $ | 378,501 |  |  | $ | — |  |  | $ | — |  |  | $ | 378,501 |
Commercial paper | 8,959 |  |  | — |  |  | — |  |  | 8,959 |
U.S. treasury debt securities | 20,860 |  |  | 190 |  |  | — |  |  | 21,050 |
U.S. corporate debt securities | 75,844 |  |  | 599 |  |  | (1) |  |  | 76,442 |
| $ | 484,164 |  |  | $ | 789 |  |  | $ | (1) |  |  | $ | 484,952 |
Included in cash and cash equivalents | $ | 378,501 |  |  | $ | — |  |  | $ | — |  |  | $ | 378,501 |
Included in marketable securities | $ | 105,663 |  |  | $ | 789 |  |  | $ | (1) |  |  | $ | 106,451 |
At December 31, 2019, cash equivalents and marketable securities consisted of the following (in thousands):
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
Money market funds | $ | 360,471 |  |  | $ | — |  |  | $ | — |  |  | $ | 360,471 |
U.S. treasury debt securities | 10,342 |  |  | 8 |  |  | (1) |  |  | 10,349 |
U.S. corporate debt securities | 95,706 |  |  | 164 |  |  | (5) |  |  | 95,865 |
| $ | 466,519 |  |  | $ | 172 |  |  | $ | (6) |  |  | $ | 466,685 |
Included in cash and cash equivalents | $ | 360,471 |  |  | $ | — |  |  | $ | — |  |  | $ | 360,471 |
Included in marketable securities | $ | 106,048 |  |  | $ | 172 |  |  | $ | (6) |  |  | $ | 106,214 |
Schedule of Available-for-sale Securities, Continuous Unrealized Loss Position | The following table presents gross unrealized losses and fair values for those marketable securities that were in an unrealized loss position as of June 30, 2020, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in thousands):
| As of June 30, 2020 |  |  |  |  |  |
| Less than 12 months |  |  |  | 12 months or greater |  |
| Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
U.S. corporate debt securities | $ | 3,846 |  |  | $ | (1) |  |  | $ | — |  |  | $ | — |
Total | $ | 3,846 |  |  | $ | (1) |  |  | $ | — |  |  | $ | — |

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