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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Cash, cash equivalents and marketable securities | $ 1,297,157 |
Gross Unrealized Gains |  |
Cash, cash equivalents and marketable securities | 9 |
Gross Unrealized Losses |  |
Cash, cash equivalents and marketable securities | (504) |
Fair Value |  |
Cash and cash equivalents | 1,099,370 | $ 960,843
Cash, cash equivalents and marketable securities | 1,296,662 |
Cash |  |
Amortized Cost |  |
Cash and cash equivalents | 754,802 |
Fair Value |  |
Cash and cash equivalents | 754,802 | $ 441,600
Cash and Cash Equivalents |  |
Fair Value |  |
Cash, cash equivalents and marketable securities | 1,099,370 |
Cash and Cash Equivalents | Cash |  |
Fair Value |  |
Cash and cash equivalents | 754,802 |
Marketable securities, short-term |  |
Fair Value |  |
Cash, cash equivalents and marketable securities | 71,972 |
Marketable securities, long-term |  |
Fair Value |  |
Cash, cash equivalents and marketable securities | 125,320 |
Money market funds |  |
Amortized Cost |  |
Cash and cash equivalents | 343,012 |
Gross Unrealized Losses |  |
Cash and cash equivalents | (2) |
Fair Value |  |
Cash and cash equivalents | 343,010 |
Money market funds | Cash and Cash Equivalents |  |
Fair Value |  |
Cash and cash equivalents | 343,010 |
Corporate bonds |  |
Amortized Cost |  |
Marketable securities | 115,507 |
Gross Unrealized Gains |  |
Marketable securities | 9 |
Gross Unrealized Losses |  |
Marketable securities | (398) |
Fair Value |  |
Marketable securities | 115,118 |
Corporate bonds | Cash and Cash Equivalents |  |
Fair Value |  |
Marketable securities | 1,042 |
Corporate bonds | Marketable securities, short-term |  |
Fair Value |  |
Marketable securities | 35,065 |
Corporate bonds | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | 79,011 |
U.S. government treasury bonds |  |
Amortized Cost |  |
Marketable securities | 42,976 |
Gross Unrealized Gains |  |
Marketable securities | 0 |
Gross Unrealized Losses |  |
Marketable securities | (48) |
Fair Value |  |
Marketable securities | 42,928 |
U.S. government treasury bonds | Marketable securities, short-term |  |
Fair Value |  |
Marketable securities | 22,251 |
U.S. government treasury bonds | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | 20,677 |
Asset-backed securities |  |
Amortized Cost |  |
Marketable securities | 32,031 |
Gross Unrealized Gains |  |
Marketable securities | 0 |
Gross Unrealized Losses |  |
Marketable securities | (40) |
Fair Value |  |
Marketable securities | 31,991 |
Asset-backed securities | Marketable securities, short-term |  |
Fair Value |  |
Marketable securities | 10,999 |
Asset-backed securities | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | 20,992 |
Municipal bonds |  |
Amortized Cost |  |
Marketable securities | 7,628 |
Gross Unrealized Gains |  |
Marketable securities | 0 |
Gross Unrealized Losses |  |
Marketable securities | (15) |
Fair Value |  |
Marketable securities | 7,613 |
Municipal bonds | Cash and Cash Equivalents |  |
Fair Value |  |
Marketable securities | 516 |
Municipal bonds | Marketable securities, short-term |  |
Fair Value |  |
Marketable securities | 3,657 |
Municipal bonds | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | 3,440 |
U.S. government agency bonds |  |
Amortized Cost |  |
Marketable securities | 1,201 |
Gross Unrealized Gains |  |
Marketable securities | 0 |
Gross Unrealized Losses |  |
Marketable securities | (1) |
Fair Value |  |
Marketable securities | 1,200 |
U.S. government agency bonds | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | $ 1,200 |

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