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Fair Value Measurements and Fair Value of Financial Instruments - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets:
Investments, Fair Value	$ 889,114
Fair Value, Recurring
Assets:
Cash and cash equivalents, Amortized Cost	545,292	$ 834,691
Cash and cash equivalents, Gross Unrealized Gains	0
Cash and cash equivalents, Gross Unrealized Losses	(158)	(34)
Cash and cash equivalents, Fair Value	545,134	834,657
Investments, Amortized Cost	891,246	123,595
Investments, Gross Unrealized Gains	1	39
Investments, Gross Unrealized Losses	(2,133)	(366)
Investments, Fair Value	889,114	123,268
Total assets measured at fair value, Amortized Cost	1,436,538	958,286
Total assets measured at fair value, Gross Unrealized Gains	1	39
Total assets measured at fair value, Gross Unrealized Losses	(2,291)	(400)
Total assets measured at fair value, Fair Value	1,434,248	957,925
Fair Value, Recurring | Cash | Level 1
Assets:
Cash and cash equivalents, Amortized Cost	58,838	56,198
Cash and cash equivalents, Fair Value	58,838	56,198
Fair Value, Recurring | Money Market Funds | Level 1
Assets:
Cash and cash equivalents, Amortized Cost	49,321	680,934
Cash and cash equivalents, Fair Value	49,321	680,934
Fair Value, Recurring | Commercial Paper | Level 2
Assets:
Cash and cash equivalents, Amortized Cost	437,133	92,581
Cash and cash equivalents, Gross Unrealized Losses	(158)	(34)
Cash and cash equivalents, Fair Value	436,975	92,547
Fair Value, Recurring | U.S. Treasury Securities | Level 1
Assets:
Investments, Amortized Cost	498,495	37,651
Investments, Gross Unrealized Gains	0
Investments, Gross Unrealized Losses	(1,012)	(70)
Investments, Fair Value	497,483	37,581
Fair Value, Recurring | Commercial Paper | Level 2
Assets:
Investments, Amortized Cost	137,780	28,161
Investments, Gross Unrealized Losses	(12)	(17)
Investments, Fair Value	137,768	28,144
Fair Value, Recurring | Corporate Debt | Level 2
Assets:
Investments, Amortized Cost	126,820	25,402
Investments, Gross Unrealized Gains	0
Investments, Gross Unrealized Losses	(342)	(131)
Investments, Fair Value	126,478	25,271
Fair Value, Recurring | Asset-backed Securities | Level 2
Assets:
Investments, Amortized Cost	24,655	6,954
Investments, Gross Unrealized Gains		20
Investments, Gross Unrealized Losses	(53)
Investments, Fair Value	24,602	6,974
Fair Value, Recurring | U.S. Government Agency Securities | Level 2
Assets:
Cash and cash equivalents, Amortized Cost		4,978
Cash and cash equivalents, Fair Value		4,978
Investments, Amortized Cost	103,496	25,427
Investments, Gross Unrealized Gains	1	19
Investments, Gross Unrealized Losses	(714)	(148)
Investments, Fair Value	$ 102,783	$ 25,298

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