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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financial Assets:
Marketable Securities:	$ 1,464,681	$ 1,283,473
Commercial paper
Financial Assets:
Marketable Securities:	219,879	151,356
Certificates of deposit
Financial Assets:
Marketable Securities:	72,679	14,569
Non-U.S. government securities
Financial Assets:
Marketable Securities:	7,959	8,054
Fair Value, Recurring
Financial Assets:
Total financial assets	1,673,357	1,525,044
Fair Value, Recurring | Money market funds
Financial Assets:
Cash equivalents:	182,572	241,571
Fair Value, Recurring | Commercial paper
Financial Assets:
Cash equivalents:	25,314
Marketable Securities:	219,879	151,356
Fair Value, Recurring | Corporate debt securities
Financial Assets:
Cash equivalents:	790
Marketable Securities:	985,985	1,032,052
Fair Value, Recurring | Certificates of deposit
Financial Assets:
Marketable Securities:	72,679	14,569
Fair Value, Recurring | U.S. government treasury securities
Financial Assets:
Marketable Securities:	178,179	77,442
Fair Value, Recurring | Non-U.S. government securities
Financial Assets:
Marketable Securities:	7,959	8,054
Fair Value, Recurring | Level 1
Financial Assets:
Total financial assets	182,572	241,571
Fair Value, Recurring | Level 1 | Money market funds
Financial Assets:
Cash equivalents:	182,572	241,571
Fair Value, Recurring | Level 1 | Commercial paper
Financial Assets:
Cash equivalents:	0
Marketable Securities:	0	0
Fair Value, Recurring | Level 1 | Corporate debt securities
Financial Assets:
Cash equivalents:	0
Marketable Securities:	0	0
Fair Value, Recurring | Level 1 | Certificates of deposit
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 1 | U.S. government treasury securities
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 1 | Non-U.S. government securities
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 2
Financial Assets:
Total financial assets	1,490,785	1,283,473
Fair Value, Recurring | Level 2 | Money market funds
Financial Assets:
Cash equivalents:	0	0
Fair Value, Recurring | Level 2 | Commercial paper
Financial Assets:
Cash equivalents:	25,314
Marketable Securities:	219,879	151,356
Fair Value, Recurring | Level 2 | Corporate debt securities
Financial Assets:
Cash equivalents:	790
Marketable Securities:	985,985	1,032,052
Fair Value, Recurring | Level 2 | Certificates of deposit
Financial Assets:
Marketable Securities:	72,679	14,569
Fair Value, Recurring | Level 2 | U.S. government treasury securities
Financial Assets:
Marketable Securities:	178,179	77,442
Fair Value, Recurring | Level 2 | Non-U.S. government securities
Financial Assets:
Marketable Securities:	7,959	8,054
Fair Value, Recurring | Level 3
Financial Assets:
Total financial assets	0	0
Fair Value, Recurring | Level 3 | Money market funds
Financial Assets:
Cash equivalents:	0	0
Fair Value, Recurring | Level 3 | Commercial paper
Financial Assets:
Cash equivalents:	0
Marketable Securities:	0	0
Fair Value, Recurring | Level 3 | Corporate debt securities
Financial Assets:
Cash equivalents:	0
Marketable Securities:	0	0
Fair Value, Recurring | Level 3 | Certificates of deposit
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 3 | U.S. government treasury securities
Financial Assets:
Marketable Securities:	0	0
Fair Value, Recurring | Level 3 | Non-U.S. government securities
Financial 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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