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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2022
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities at Fair Value | The following tables present the fair value hierarchy for assets and liabilities measured at fair value:
| June 30, 2022
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
Cash equivalents |  |  |  |  |  |  |
Money market funds | $ | 468,318 |  |  | $ | — |  |  | $ | — |  |  | $ | 468,318 |
Marketable securities |  |  |  |  |  |  |
U.S. government securities | 410,449 |  |  | — |  |  | — |  |  | 410,449 |
Commercial paper | — |  |  | 18,972 |  |  | — |  |  | 18,972 |
Corporate debt securities | — |  |  | 15,452 |  |  | — |  |  | 15,452 |
Total assets | $ | 878,767 |  |  | $ | 34,424 |  |  | $ | — |  |  | $ | 913,191 |
| December 31, 2021
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
Cash equivalents |  |  |  |  |  |  |
Money market funds | $ | 1,213,543 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,213,543 |
Marketable securities |  |  |  |  |  |  |
U.S. government securities | 418,284 |  |  | — |  |  | — |  |  | 418,284 |
Commercial paper | — |  |  | 13,878 |  |  | — |  |  | 13,878 |
Asset-backed securities | — |  |  | 2,002 |  |  | — |  |  | 2,002 |
Corporate debt securities | — |  |  | 18,711 |  |  | — |  |  | 18,711 |
Total assets | $ | 1,631,827 |  |  | $ | 34,591 |  |  | $ | — |  |  | $ | 1,666,418 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19279-110258 + Details
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