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Investments - Schedule of Available-for-sale Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Short-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	$ 413,965	$ 564,036
Unrealized Gain	262	809
Unrealized Loss		(12)
Estimated Fair Value	414,227	564,833
Long-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	91,177	118,429
Unrealized Gain	4	98
Unrealized Loss	(50)	(2)
Estimated Fair Value	91,131	118,525
U.S. Government Debt Securities | Short-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	403,968	552,539
Unrealized Gain	257	723
Unrealized Loss		(10)
Estimated Fair Value	404,225	553,252
U.S. Government Debt Securities | Long-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	71,328	118,429
Unrealized Gain		98
Unrealized Loss	(43)	(2)
Estimated Fair Value	71,285	118,525
Corporate Bonds | Short-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	9,997	11,497
Unrealized Gain	5	86
Unrealized Loss		(2)
Estimated Fair Value	10,002	$ 11,581
Corporate Bonds | Long-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	19,849
Unrealized Gain	4
Unrealized Loss	(7)
Estimated Fair Value	$ 19,846

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