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Cash, cash equivalents and marketable securities - Composition of Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Cash and cash equivalents: |  |
Amortized Cost | $ 1,361,980 | $ 1,611,082
Unrealized Gains | 0 | 2
Unrealized Losses | (44) | (21)
Fair Value | 1,361,936 | 1,611,063
Marketable securities: |  |
Amortized Cost | 1,149,425 | 1,097,467
Unrealized Gains | 1,896 | 380
Unrealized Losses | (2,173) | (10,683)
Fair Value | 1,149,148 | 1,087,164
Total |  |
Amortized Cost | 2,511,405 | 2,708,549
Unrealized Gains | 1,896 | 382
Unrealized Losses | (2,217) | (10,704)
Fair Value | 2,511,084 | 2,698,227
Corporate bonds |  |
Marketable securities: |  |
Amortized Cost | 428,002 | 370,445
Unrealized Gains | 1,277 | 172
Unrealized Losses | (1,322) | (7,542)
Fair Value | 427,957 | 363,075
Commercial paper |  |
Marketable securities: |  |
Amortized Cost | 200,963 | 241,407
Unrealized Gains | 212 | 71
Unrealized Losses | (30) | (286)
Fair Value | 201,145 | 241,192
U.S. treasury securities |  |
Marketable securities: |  |
Amortized Cost | 336,721 | 244,056
Unrealized Gains | 251 | 33
Unrealized Losses | (616) | (1,173)
Fair Value | 336,356 | 242,916
Certificates of deposit |  |
Marketable securities: |  |
Amortized Cost | 132,314 | 158,607
Unrealized Gains | 152 | 60
Unrealized Losses | (9) | (421)
Fair Value | 132,457 | 158,246
Municipal securities |  |
Marketable securities: |  |
Amortized Cost |  | 28,029
Unrealized Gains |  | 4
Unrealized Losses |  | (584)
Fair Value |  | 27,449
Non-U.S. government and supranational bonds |  |
Marketable securities: |  |
Amortized Cost | 9,101 | 23,228
Unrealized Gains | 1 | 0
Unrealized Losses | (119) | (629)
Fair Value | 8,983 | 22,599
U.S. agency bonds |  |
Marketable securities: |  |
Amortized Cost | 42,324 | 31,695
Unrealized Gains | 3 | 40
Unrealized Losses | (77) | (48)
Fair Value | 42,250 | 31,687
Cash |  |
Cash and cash equivalents: |  |
Amortized Cost | 220,583 | 474,365
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 220,583 | 474,365
Money market funds |  |
Cash and cash equivalents: |  |
Amortized Cost | 1,032,675 | 1,017,191
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 1,032,675 | 1,017,191
Commercial paper |  |
Cash and cash equivalents: |  |
Amortized Cost | 106,312 | 111,996
Unrealized Gains | 0 | 0
Unrealized Losses | (44) | (21)
Fair Value | 106,268 | 111,975
Corporate bonds |  |
Cash and cash equivalents: |  |
Amortized Cost | 859 | 1,542
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 859 | 1,542
U.S. treasury securities |  |
Cash and cash equivalents: |  |
Amortized Cost |  | 5,988
Unrealized Gains |  | 2
Unrealized Losses |  | 0
Fair Value |  | $ 5,990
Certificates of deposit |  |
Cash and cash equivalents: |  |
Amortized Cost | 1,551 |
Unrealized Gains | 0 |
Unrealized Losses | 0 |
Fair Value | $ 1,551 |

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