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Investments - Schedule of Available-for-sale Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Short-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	$ 564,036	$ 479,791
Unrealized Gain	809	503
Unrealized Loss	(12)	(4)
Estimated Fair Value	564,833	480,290
Long-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	118,429	105,263
Unrealized Gain	98	181
Unrealized Loss	(2)	(9)
Estimated Fair Value	118,525	105,435
Commercial Paper | Short-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost		121,866
Estimated Fair Value		121,866
U.S. Government Debt Securities | Short-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	552,539	285,963
Unrealized Gain	723	394
Unrealized Loss	(10)	(1)
Estimated Fair Value	553,252	286,356
U.S. Government Debt Securities | Long-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	118,429	90,750
Unrealized Gain	98	146
Unrealized Loss	(2)	(9)
Estimated Fair Value	118,525	90,887
Corporate Bonds | Short-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	11,497	71,962
Unrealized Gain	86	109
Unrealized Loss	(2)	(3)
Estimated Fair Value	$ 11,581	72,068
Corporate Bonds | Long-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost		14,513
Unrealized Gain		35
Estimated Fair Value		$ 14,548

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