Marketable Securities - Amortized Cost and Fair Value of Debt Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value to Amortized Cost
Amortized Cost	$ 321,019	$ 192,971
Allowance for Credit Losses	0	0
Net Amortized Cost	321,019	192,971
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(3,340)	(324)
Fair Value	317,679	192,648
Corporate bonds - U.S.
Fair Value to Amortized Cost
Amortized Cost	220,913	130,388
Allowance for Credit Losses	0	0
Net Amortized Cost	220,913	130,388
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(2,589)	(234)
Fair Value	218,324	130,155
Corporate bonds - Foreign
Fair Value to Amortized Cost
Amortized Cost	30,276	20,643
Allowance for Credit Losses	0	0
Net Amortized Cost	30,276	20,643
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(411)	(82)
Fair Value	29,865	20,561
Government related obligations - U.S.
Fair Value to Amortized Cost
Amortized Cost	69,830	41,939
Allowance for Credit Losses	0	0
Net Amortized Cost	69,830	41,939
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(340)	(8)
Fair Value	$ 69,490	$ 41,931