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Cash and Cash Equivalents, and Investments - Schedule of Available For Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	$ 2,536,512
Fair Value	2,536,344
Cash and cash equivalents:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	713,837	$ 479,853
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	713,837	479,853
Short-term investments:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	1,038,124	664,119
Unrealized Gain	347	1,502
Unrealized Loss	(126)	(54)
Fair Value	1,038,345	665,567
Long-term investments:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	813,889	523,270
Unrealized Gain	142	641
Unrealized Loss	(531)	(283)
Fair Value	813,500	523,628
Commercial paper | Short-term investments:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	364,098	204,152
Unrealized Gain	49	24
Unrealized Loss	(4)	(6)
Fair Value	364,143	204,170
Corporate debt securities | Short-term investments:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	658,525	459,967
Unrealized Gain	280	1,478
Unrealized Loss	(122)	(48)
Fair Value	658,683	461,397
Corporate debt securities | Long-term investments:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	813,889	484,275
Unrealized Gain	142	605
Unrealized Loss	(531)	(283)
Fair Value	813,500	484,597
Agency bonds | Short-term investments:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	15,501
Unrealized Gain	18
Unrealized Loss	0
Fair Value	15,519
Agency bonds | Long-term investments:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost		38,995
Unrealized Gain		36
Unrealized Loss		0
Fair Value		39,031
Cash | Cash and cash equivalents:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	29,338	15,054
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	29,338	15,054
Money market funds | Cash and cash equivalents:
Debt Securities, Available-for-sale [Line Items]
Adjusted Cost	684,499	464,799
Unrealized Gain	0	0
Unrealized Loss	0	0
Fair Value	$ 684,499	$ 464,799

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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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