Investments - Schedule of Available-for-sale Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Short-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	$ 214,115	$ 564,036
Unrealized Gain	4	809
Unrealized Loss	(123)	(12)
Estimated Fair Value	213,996	564,833
Long-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	218,163	118,429
Unrealized Gain		98
Unrealized Loss	(1,018)	(2)
Estimated Fair Value	217,145	118,525
U.S. Government Debt Securities | Short-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	186,752	552,539
Unrealized Gain	4	723
Unrealized Loss	(109)	(10)
Estimated Fair Value	186,647	553,252
U.S. Government Debt Securities | Long-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	205,472	118,429
Unrealized Gain		98
Unrealized Loss	(974)	(2)
Estimated Fair Value	204,498	118,525
Corporate Bonds | Short-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	27,363	11,497
Unrealized Gain		86
Unrealized Loss	(14)	(2)
Estimated Fair Value	27,349	$ 11,581
Corporate Bonds | Long-Term Marketable Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	12,691
Unrealized Loss	(44)
Estimated Fair Value	$ 12,647