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Investments and Fair Value Measurements - Cash, Cash Equivalent and Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Cash and cash equivalents: | $ 87,897 | $ 166,068 | $ 282,131
Marketable securities, current | 445,048 | 361,795 |
Marketable securities, non-current | 186,066 | 528,911 |
Total marketable securities | 631,114 | 890,706 |
Total cash, cash equivalents and marketable securities | 719,011 | 1,056,774 |
U.S. Treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Marketable securities, current | 327,868 | 184,946 |
Marketable securities, non-current | 0 | 239,528 |
Total marketable securities | 327,868 | 424,475 |
Corporate notes and bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Marketable securities, current | 84,342 | 11,327 |
Marketable securities, non-current | 152,773 | 197,298 |
Total marketable securities | 237,115 | 208,625 |
Commercial paper |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Marketable securities, current | 6,498 | 124,089 |
Total marketable securities | 6,498 | 124,089 |
Asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Marketable securities, current | 6,464 | 21,576 |
Marketable securities, non-current | 31,077 | 77,142 |
Total marketable securities | 37,541 | 98,717 |
Municipal securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Marketable securities, current | 0 | 2,250 |
Total marketable securities | 2,216 | 4,562 |
Municipal securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Marketable securities, non-current | 2,216 | 2,312 |
Foreign government and supranational securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Marketable securities, current | 19,876 | 17,607 |
Marketable securities, non-current | 0 | 12,631 |
Total marketable securities | 19,876 | 30,238 |
Cash |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cash and cash equivalents: | 42,673 | 134,774 |
Money market funds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cash and cash equivalents: | $ 45,224 | $ 31,294 |

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