Fair Value Measurements - Marketable Securities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Marketable Securities [Line Items]
Amortized Cost	$ 914,536	$ 1,610,775
Gross Unrealized Gains	0	1,194
Gross Unrealized Losses	(37,634)	(5,580)
Aggregate Fair Value	876,902	1,606,389
Short-Term Marketable Securities	405,562	540,574
Long-Term Marketable Securities	471,340	1,065,815
Commercial paper
Marketable Securities [Line Items]
Amortized Cost		25,056
Gross Unrealized Gains		0
Gross Unrealized Losses		(24)
Aggregate Fair Value		25,032
Short-Term Marketable Securities		25,032
Long-Term Marketable Securities		0
Corporate bonds
Marketable Securities [Line Items]
Amortized Cost	642,443	1,268,991
Gross Unrealized Gains	0	1,191
Gross Unrealized Losses	(25,708)	(4,275)
Aggregate Fair Value	616,735	1,265,907
Short-Term Marketable Securities	315,656	459,012
Long-Term Marketable Securities	301,079	806,895
Available-for-sale marketable securities, continuous unrealized loss position for more than 12 months	329,600
Unrealized loss related to corporate bonds	13,200
U.S. government agency obligations
Marketable Securities [Line Items]
Amortized Cost	272,093	316,728
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(11,926)	(1,281)
Aggregate Fair Value	260,167	315,450
Short-Term Marketable Securities	89,906	56,530
Long-Term Marketable Securities	$ 170,261	$ 258,920