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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Summary of Cash Equivalents and Marketable Securities Recorded at Fair Value | A summary of the Company’s cash equivalents and marketable securities as of December 31, 2021 and 2020, which are recorded at fair value (and excludes $405.6 million and $395.1 million of cash at December 31, 2021 and 2020, respectively) is shown below (in thousands):
December 31, 2021 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 507,386 |  |  | $ | — |  |  | $ | — |  |  | $ | 507,386 |
Corporate debt securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Certificates of deposit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Commercial paper |  |  | 9,997 |  |  |  | — |  |  |  | (1 | ) |  |  | 9,996 |
Total cash equivalents |  |  | 517,383 |  |  |  | — |  |  |  | (1 | ) |  |  | 517,382 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | 16,238 |  |  |  | 6 |  |  |  | (52 | ) |  |  | 16,192 |
Corporate debt securities |  |  | 1,173,659 |  |  |  | 10 |  |  |  | (4,903 | ) |  |  | 1,168,766 |
Certificates of deposit |  |  | 45,164 |  |  |  | — |  |  |  | — |  |  |  | 45,164 |
Government-sponsored enterprise securities |  |  | 13,334 |  |  |  | — |  |  |  | (77 | ) |  |  | 13,257 |
Commercial paper |  |  | 212,805 |  |  |  | — |  |  |  | (86 | ) |  |  | 212,719 |
Total marketable securities |  |  | 1,461,200 |  |  |  | 16 |  |  |  | (5,118 | ) |  |  | 1,456,098 |
Total cash equivalents and marketable securities |  | $ | 1,978,583 |  |  | $ | 16 |  |  | $ | (5,119 | ) |  | $ | 1,973,480 |
December 31, 2020 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
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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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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