Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Short-term marketable securities
Gross Amortized Cost	$ 343,758	$ 291,029
Total Unrealized Gains	2	3
Total Unrealized Losses	(1,188)	(214)
Fair Value	342,572	290,818
Long-term marketable securities
Gross Amortized Cost	105,453	168,233
Total Unrealized Gains	0	0
Total Unrealized Losses	(1,322)	(466)
Fair Value	104,131	167,767
Commercial paper
Short-term marketable securities
Gross Amortized Cost	109,247	116,937
Total Unrealized Gains	0	1
Total Unrealized Losses	(228)	(36)
Fair Value	109,019	116,902
Corporate bonds
Short-term marketable securities
Gross Amortized Cost	224,119	166,311
Total Unrealized Gains	2	2
Total Unrealized Losses	(897)	(170)
Fair Value	223,224	166,143
Long-term marketable securities
Gross Amortized Cost	103,953	164,071
Total Unrealized Gains	0	0
Total Unrealized Losses	(1,293)	(437)
Fair Value	102,660	163,634
Municipal bonds
Short-term marketable securities
Gross Amortized Cost	10,392	7,781
Total Unrealized Gains	0	0
Total Unrealized Losses	(63)	(8)
Fair Value	10,329	7,773
Long-term marketable securities
Gross Amortized Cost	1,500	4,162
Total Unrealized Gains	0	0
Total Unrealized Losses	(29)	(29)
Fair Value	$ 1,471	$ 4,133