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Financial Instruments - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Cash, cash equivalents and marketable securities | $ 1,123,786 | $ 1,297,157
Gross Unrealized Gains |  |
Cash, cash equivalents and marketable securities | 3 | 9
Gross Unrealized Losses |  |
Cash, cash equivalents and marketable securities | (3,226) | (504)
Fair Value |  |
Cash and cash equivalents | 926,119 | 1,099,370
Cash, cash equivalents and marketable securities | 1,120,563 | 1,296,662
Cash |  |
Amortized Cost |  |
Cash and cash equivalents | 689,175 | 754,802
Fair Value |  |
Cash and cash equivalents | 689,175 | 754,802
Cash and Cash Equivalents |  |
Fair Value |  |
Cash, cash equivalents and marketable securities | 926,119 | 1,099,370
Cash and Cash Equivalents | Cash |  |
Fair Value |  |
Cash and cash equivalents | 689,175 | 754,802
Marketable securities, short-term |  |
Fair Value |  |
Cash, cash equivalents and marketable securities | 86,749 | 71,972
Marketable securities, long-term |  |
Fair Value |  |
Cash, cash equivalents and marketable securities | 107,695 | 125,320
Money market funds |  |
Amortized Cost |  |
Cash and cash equivalents | 236,960 | 343,012
Gross Unrealized Losses |  |
Cash and cash equivalents | (16) | (2)
Fair Value |  |
Cash and cash equivalents | 236,944 | 343,010
Money market funds | Cash and Cash Equivalents |  |
Fair Value |  |
Cash and cash equivalents | 236,944 | 343,010
Corporate bonds |  |
Amortized Cost |  |
Marketable securities | 116,307 | 115,507
Gross Unrealized Gains |  |
Marketable securities | 3 | 9
Gross Unrealized Losses |  |
Marketable securities | (2,389) | (398)
Fair Value |  |
Marketable securities | 113,921 | 115,118
Corporate bonds | Cash and Cash Equivalents |  |
Fair Value |  |
Marketable securities |  | 1,042
Corporate bonds | Marketable securities, short-term |  |
Fair Value |  |
Marketable securities | 41,164 | 35,065
Corporate bonds | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | 72,757 | 79,011
U.S. government treasury bonds |  |
Amortized Cost |  |
Marketable securities | 46,638 | 42,976
Gross Unrealized Gains |  |
Marketable securities | 0 | 0
Gross Unrealized Losses |  |
Marketable securities | (511) | (48)
Fair Value |  |
Marketable securities | 46,127 | 42,928
U.S. government treasury bonds | Marketable securities, short-term |  |
Fair Value |  |
Marketable securities | 31,055 | 22,251
U.S. government treasury bonds | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | 15,072 | 20,677
Asset-backed securities |  |
Amortized Cost |  |
Marketable securities | 27,453 | 32,031
Gross Unrealized Gains |  |
Marketable securities | 0 | 0
Gross Unrealized Losses |  |
Marketable securities | (197) | (40)
Fair Value |  |
Marketable securities | 27,256 | 31,991
Asset-backed securities | Marketable securities, short-term |  |
Fair Value |  |
Marketable securities | 10,984 | 10,999
Asset-backed securities | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | 16,272 | 20,992
Municipal bonds |  |
Amortized Cost |  |
Marketable securities | 6,049 | 7,628
Gross Unrealized Gains |  |
Marketable securities | 0 | 0
Gross Unrealized Losses |  |
Marketable securities | (77) | (15)
Fair Value |  |
Marketable securities | 5,972 | 7,613
Municipal bonds | Cash and Cash Equivalents |  |
Fair Value |  |
Marketable securities |  | 516
Municipal bonds | Marketable securities, short-term |  |
Fair Value |  |
Marketable securities | 3,546 | 3,657
Municipal bonds | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | 2,426 | 3,440
U.S. government agency bonds |  |
Amortized Cost |  |
Marketable securities | 1,204 | 1,201
Gross Unrealized Gains |  |
Marketable securities | 0 | 0
Gross Unrealized Losses |  |
Marketable securities | (36) | (1)
Fair Value |  |
Marketable securities | 1,168 | 1,200
U.S. government agency bonds | Marketable securities, long-term |  |
Fair Value |  |
Marketable securities | $ 1,168 | $ 1,200

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