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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2021
Investments Debt And Equity Securities [Abstract] |
Summary of Cash Equivalents and Marketable Securities Recorded at Fair Value | The following table summarizes cash equivalents and marketable securities held at March 31, 2021 and December 31, 2020 (in thousands), which are recorded at fair value. The table below excludes $494.2 million and $395.1 million of cash at March 31, 2021 and December 31, 2020, respectively.
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
March 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 629,357 |  |  | $ | — |  |  | $ | — |  |  | $ | 629,357 |
Corporate debt securities |  |  | 2,533 |  |  |  | 1 |  |  |  | (2 | ) |  |  | 2,532 |
Certificates of deposit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Commercial paper |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total cash equivalents |  |  | 631,890 |  |  |  | 1 |  |  |  | (2 | ) |  |  | 631,889 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Corporate debt securities |  |  | 536,144 |  |  |  | 37 |  |  |  | (551 | ) |  |  | 535,630 |
Certificates of deposit |  |  | 54,273 |  |  |  | — |  |  |  | — |  |  |  | 54,273 |
Government-sponsored enterprise securities |  |  | 3,120 |  |  |  | — |  |  |  | (1 | ) |  |  | 3,119 |
Commercial paper |  |  | 87,120 |  |  |  | 2 |  |  |  | — |  |  |  | 87,122 |
Total marketable securities |  |  | 680,657 |  |  |  | 39 |  |  |  | (552 | ) |  |  | 680,144 |
Total cash equivalents and marketable securities |  | $ | 1,312,547 |  |  | $ | 40 |  |  | $ | (554 | ) |  | $ | 1,312,033 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 742,958 |  |  | $ | — |  |  | $ | — |  |  | $ | 742,958 |
Corporate debt securities |  |  | 2,526 |  |  |  | 1 |  |  |  | (24 | ) |  |  | 2,503 |
Certificates of deposit |  |  | 12,527 |  |  |  | — |  |  |  | — |  |  |  | 12,527 |
Commercial paper |  |  | 15,549 |  |  |  | — |  |  |  | — |  |  |  | 15,549 |
Total cash equivalents |  |  | 773,560 |  |  |  | 1 |  |  |  | (24 | ) |  |  | 773,537 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | 47,976 |  |  |  | 3 |  |  |  | — |  |  |  | 47,979 |
Corporate debt securities |  |  | 324,569 |  |  |  | 43 |  |  |  | (156 | ) |  |  | 324,456 |
Certificates of deposit |  |  | 25,162 |  |  |  | — |  |  |  | — |  |  |  | 25,162 |
Government-sponsored enterprise securities |  |  | 33,738 |  |  |  | 5 |  |  |  | (2 | ) |  |  | 33,741 |
Commercial paper |  |  | 90,375 |  |  |  | — |  |  |  | — |  |  |  | 90,375 |
Total marketable securities |  |  | 521,820 |  |  |  | 51 |  |  |  | (158 | ) |  |  | 521,713 |
Total cash equivalents and marketable securities |  | $ | 1,295,380 |  |  | $ | 52 |  |  | $ | (182 | ) |  | $ | 1,295,250 |

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