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Fair Value Measurements - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets
Marketable securities	$ 444,873	$ 452,875
Fair Value, Measurements, Recurring
Assets
Total assets	913,191	1,666,418
Fair Value, Measurements, Recurring | Money market funds
Assets
Money market funds	468,318	1,213,543
Fair Value, Measurements, Recurring | U.S. government securities
Assets
Marketable securities	410,449	418,284
Fair Value, Measurements, Recurring | Commercial paper
Assets
Marketable securities	18,972	13,878
Fair Value, Measurements, Recurring | Asset-backed securities
Assets
Marketable securities		2,002
Fair Value, Measurements, Recurring | Corporate debt securities
Assets
Marketable securities	15,452	18,711
Fair Value, Measurements, Recurring | Level 1
Assets
Total assets	878,767	1,631,827
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Assets
Money market funds	468,318	1,213,543
Fair Value, Measurements, Recurring | Level 1 | U.S. government securities
Assets
Marketable securities	410,449	418,284
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	34,424	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. government securities
Assets
Marketable securities	0	0
Fair Value, Measurements, Recurring | Level 2 | Commercial paper
Assets
Marketable securities	18,972	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	15,452	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. government securities
Assets
Marketable securities	0	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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