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Financial Instruments - Schedule of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Marketable securities:
Amortized Cost	$ 598,163
Fair Value	591,475	$ 681,323
Level 1 securities:
Restricted cash:
Restricted cash, amortized cost	10,755
Restricted cash, fair value	10,755	10,823
Cash equivalents:
Cash equivalents, amortized cost	166,174
Cash and cash equivalents, fair value	166,174	73,138
Level 1 securities: | Money market funds
Cash equivalents:
Cash equivalents, amortized cost	166,174
Cash and cash equivalents, fair value	166,174	73,138
Level 2 securities:
Marketable securities:
Amortized Cost	598,163
Unrealized Gains	0
Unrealized Losses	(6,688)
Fair Value	591,475	681,323
Level 2 securities: | Commercial paper
Marketable securities:
Amortized Cost	127,113
Unrealized Gains	0
Unrealized Losses	0
Fair Value	127,113	59,792
Level 2 securities: | Asset-backed securities
Marketable securities:
Amortized Cost	28,317
Unrealized Gains	0
Unrealized Losses	(90)
Fair Value	28,227	40,942
Level 2 securities: | Corporate bonds
Marketable securities:
Amortized Cost	208,362
Unrealized Gains	0
Unrealized Losses	(3,465)
Fair Value	204,897	237,402
Level 2 securities: | U.S. treasury securities
Marketable securities:
Amortized Cost	181,344
Unrealized Gains	0
Unrealized Losses	(2,164)
Fair Value	179,180	272,300
Level 2 securities: | Supranational bonds
Marketable securities:
Amortized Cost	53,027
Unrealized Gains	0
Unrealized Losses	(969)
Fair Value	$ 52,058	$ 70,887

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