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Cash and Cash Equivalents, and Investments and Fair Value Measurements - Schedule of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost	$ 1,245,622
Fair Value	1,240,351
Cash and cash equivalents:
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost	473,677	$ 854,078
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	473,677	854,078
Cash and cash equivalents: | Cash
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost	33,532	30,324
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	33,532	30,324
Cash and cash equivalents: | Money market funds | Level 1
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost	440,145	823,754
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	440,145	823,754
Short-term investments:
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost	588,474	692,320
Unrealized Gain	0	40
Unrealized Loss	(4,501)	(579)
Fair Value	583,973	691,781
Short-term investments: | Commercial paper | Level 2
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost	11,744	124,211
Unrealized Gain	0	2
Unrealized Loss	(29)	(33)
Fair Value	11,715	124,180
Short-term investments: | Corporate debt securities | Level 2
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost	491,459	552,609
Unrealized Gain	0	36
Unrealized Loss	(4,130)	(546)
Fair Value	487,329	552,099
Short-term investments: | Agency bonds | Level 2
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost		15,500
Unrealized Gain		2
Unrealized Loss		0
Fair Value		15,502
Short-term investments: | U.S. treasury securities | Level 1
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost	85,271
Unrealized Gain	0
Unrealized Loss	(342)
Fair Value	84,929
Long-term investments:
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost	217,003	749,377
Unrealized Gain	280	0
Unrealized Loss	(1,050)	(3,384)
Fair Value	216,233	745,993
Long-term investments: | Corporate debt securities | Level 2
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost	125,735	724,517
Unrealized Gain	158	0
Unrealized Loss	(909)	(3,277)
Fair Value	124,984	721,240
Long-term investments: | Agency bonds
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost	60,635
Unrealized Gain	0
Unrealized Loss	(141)
Fair Value	60,494
Long-term investments: | U.S. treasury securities | Level 1
Schedule Of Available For Sale Securities [Line Items]
Adjusted Cost	30,633	24,860
Unrealized Gain	122	0
Unrealized Loss	0	(107)
Fair Value	$ 30,755	$ 24,753

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