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Cash Equivalents and Marketable Securities | 6 Months Ended
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Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
Cash Equivalents and Marketable Securities | Cash Equivalents and 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 |
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) |  |  | $ | — |  |  | $ | — |
We do not believe the unrealized losses represent credit losses based on our evaluation of available evidence as of June 30, 2020, which includes an assessment of whether it is more likely than not we will be required to sell the investment before recovery of the investment's amortized cost basis.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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