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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Cash, cash equivalents and marketable securities | $ 980,714 | $ 1,297,157
Gross Unrealized Gains |  |
Cash, cash equivalents and marketable securities | 0 | 9
Gross Unrealized Losses |  |
Cash, cash equivalents and marketable securities | (3,524) | (504)
Fair Value |  |
Cash and cash equivalents | 877,501 | 1,099,370
Marketable securities | 99,689 | 198,850
Cash, cash equivalents and marketable securities | 977,190 | 1,296,662
Cash |  |
Amortized Cost |  |
Cash and cash equivalents | 758,365 | 754,802
Fair Value |  |
Cash and cash equivalents | 758,365 | 754,802
Cash and Cash Equivalents |  |
Fair Value |  |
Cash, cash equivalents and marketable securities | 877,501 | 1,099,370
Cash and Cash Equivalents | Cash |  |
Fair Value |  |
Cash and cash equivalents | 758,365 | 754,802
Marketable securities, short-term |  |
Fair Value |  |
Cash, cash equivalents and marketable securities | 22,138 | 71,972
Marketable securities, long-term |  |
Fair Value |  |
Cash, cash equivalents and marketable securities | 77,551 | 125,320
Money market funds |  |
Amortized Cost |  |
Cash and cash equivalents | 119,148 | 343,012
Gross Unrealized Losses |  |
Cash and cash equivalents | (12) | (2)
Fair Value |  |
Cash and cash equivalents | 119,136 | 343,010
Money market funds | Cash and Cash Equivalents |  |
Fair Value |  |
Cash and cash equivalents | 119,136 | 343,010
Corporate bonds |  |
Amortized Cost |  |
Marketable securities | 70,808 | 115,507
Gross Unrealized Gains |  |
Marketable securities | 0 | 9
Gross Unrealized Losses |  |
Marketable securities | (2,812) | (398)
Fair Value |  |
Marketable securities | 67,996 | 115,118
Corporate bonds | Cash and Cash Equivalents |  |
Fair Value |  |
Marketable securities |  | 1,042
Corporate bonds | Marketable securities, short-term |  |
Fair Value |  |
Marketable securities | 8,488 | 35,065
Corporate bonds | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | 59,508 | 79,011
U.S. government treasury bonds |  |
Amortized Cost |  |
Marketable securities | 18,609 | 42,976
Gross Unrealized Gains |  |
Marketable securities | 0 | 0
Gross Unrealized Losses |  |
Marketable securities | (495) | (48)
Fair Value |  |
Marketable securities | 18,114 | 42,928
U.S. government treasury bonds | Marketable securities, short-term |  |
Fair Value |  |
Marketable securities | 6,490 | 22,251
U.S. government treasury bonds | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | 11,624 | 20,677
Asset-backed securities |  |
Amortized Cost |  |
Marketable securities | 7,042 | 32,031
Gross Unrealized Gains |  |
Marketable securities | 0 | 0
Gross Unrealized Losses |  |
Marketable securities | (59) | (40)
Fair Value |  |
Marketable securities | 6,983 | 31,991
Asset-backed securities | Marketable securities, short-term |  |
Fair Value |  |
Marketable securities | 3,113 | 10,999
Asset-backed securities | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | 3,870 | 20,992
Municipal bonds |  |
Amortized Cost |  |
Marketable securities | 5,541 | 7,628
Gross Unrealized Gains |  |
Marketable securities | 0 | 0
Gross Unrealized Losses |  |
Marketable securities | (100) | (15)
Fair Value |  |
Marketable securities | 5,441 | 7,613
Municipal bonds | Cash and Cash Equivalents |  |
Fair Value |  |
Marketable securities |  | 516
Municipal bonds | Marketable securities, short-term |  |
Fair Value |  |
Marketable securities | 4,047 | 3,657
Municipal bonds | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | 1,394 | 3,440
U.S. government agency bonds |  |
Amortized Cost |  |
Marketable securities | 1,201 | 1,201
Gross Unrealized Gains |  |
Marketable securities | 0 | 0
Gross Unrealized Losses |  |
Marketable securities | (46) | (1)
Fair Value |  |
Marketable securities | 1,155 | 1,200
U.S. government agency bonds | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | $ 1,155 | $ 1,200

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