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Fair Value Measurements - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets
Marketable securities	$ 440,858	$ 452,875
Fair Value, Measurements, Recurring
Assets
Total assets	903,317	1,666,418
Fair Value, Measurements, Recurring | Money market funds
Assets
Money market funds	462,459	1,213,543
Fair Value, Measurements, Recurring | U.S. treasury securities
Assets
Marketable securities	378,002	418,284
Fair Value, Measurements, Recurring | U.S. agency securities
Assets
Marketable securities	29,059
Fair Value, Measurements, Recurring | Commercial paper
Assets
Marketable securities	28,815	13,878
Fair Value, Measurements, Recurring | Asset-backed securities
Assets
Marketable securities		2,002
Fair Value, Measurements, Recurring | Corporate debt securities
Assets
Marketable securities	4,982	18,711
Fair Value, Measurements, Recurring | Level 1
Assets
Total assets	840,461	1,631,827
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Assets
Money market funds	462,459	1,213,543
Fair Value, Measurements, Recurring | Level 1 | U.S. treasury securities
Assets
Marketable securities	378,002	418,284
Fair Value, Measurements, Recurring | Level 1 | U.S. agency securities
Assets
Marketable securities	0
Fair Value, Measurements, Recurring | Level 1 | Commercial paper
Assets
Marketable securities	0	0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities
Assets
Marketable securities		0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt securities
Assets
Marketable securities	0	0
Fair Value, Measurements, Recurring | Level 2
Assets
Total assets	62,856	34,591
Fair Value, Measurements, Recurring | Level 2 | Money market funds
Assets
Money market funds	0	0
Fair Value, Measurements, Recurring | Level 2 | U.S. treasury securities
Assets
Marketable securities	0	0
Fair Value, Measurements, Recurring | Level 2 | U.S. agency securities
Assets
Marketable securities	29,059
Fair Value, Measurements, Recurring | Level 2 | Commercial paper
Assets
Marketable securities	28,815	13,878
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities
Assets
Marketable securities		2,002
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities
Assets
Marketable securities	4,982	18,711
Fair Value, Measurements, Recurring | Level 3
Assets
Total assets	0	0
Fair Value, Measurements, Recurring | Level 3 | Money market funds
Assets
Money market funds	0	0
Fair Value, Measurements, Recurring | Level 3 | U.S. treasury securities
Assets
Marketable securities	0	0
Fair Value, Measurements, Recurring | Level 3 | U.S. agency securities
Assets
Marketable securities	0
Fair Value, Measurements, Recurring | Level 3 | Commercial paper
Assets
Marketable securities	0	0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities
Assets
Marketable securities		0
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities
Assets
Marketable securities	$ 0	$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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