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Cash and Cash Equivalents, Investments and Fair Value Measurements - Schedule of Available For Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	$ 637,987
Fair Value	631,786
Cash and cash equivalents:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	94,419	$ 473,677
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	94,419	473,677
Cash and cash equivalents: | Cash
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	42,015	33,532
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	42,015	33,532
Cash and cash equivalents: | Money market funds | Level 1
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	52,404	440,145
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	52,404	440,145
Short-term investments:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	167,830	588,474
Unrealized Gain	0	0
Unrealized Loss	(989)	(4,501)
Fair Value	166,841	583,973
Short-term investments: | Commercial paper | Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost		11,744
Unrealized Gain		0
Unrealized Loss		(29)
Fair Value		11,715
Short-term investments: | Corporate debt securities | Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	58,911	491,459
Unrealized Gain	0	0
Unrealized Loss	(258)	(4,130)
Fair Value	58,653	487,329
Short-term investments: | U.S. treasury securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost		85,271
Unrealized Gain		0
Unrealized Loss		(342)
Fair Value		84,929
Short-term investments: | Agency bonds | Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	108,919
Unrealized Gain	0
Unrealized Loss	(731)
Fair Value	108,188
Long-term investments:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	417,753	217,003
Unrealized Gain	8	280
Unrealized Loss	(5,220)	(1,050)
Fair Value	412,541	216,233
Long-term investments: | Corporate debt securities | Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	220,649	125,735
Unrealized Gain	8	158
Unrealized Loss	(2,598)	(909)
Fair Value	218,059	124,984
Long-term investments: | U.S. treasury securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	98,462	30,633
Unrealized Gain	0	122
Unrealized Loss	(1,248)	0
Fair Value	97,214	30,755
Long-term investments: | Agency bonds | Level 2
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	98,642	60,635
Unrealized Gain	0	0
Unrealized Loss	(1,374)	(141)
Fair Value	$ 97,268	$ 60,494

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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