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Marketable Securities - (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Investments
Amortized Cost	$ 140,560		$ 140,560		$ 207,917
Gross Unrealized Gain					3
Gross Unrealized Loss	(2,396)		(2,396)		(666)
Estimated Fair Value	138,164		138,164		207,254
Unrealized losses in a continuous loss position for more than twelve consecutive months	59,000		59,000
Gross realized gains	0	$ 1	9	$ 57
Fair market value of investments in unrealized loss position	138,200		138,200
Cost Maturities:
Within 1 year	122,104		122,104
Between 1 to 2 years	18,456		18,456
Total investments available for sale	140,560		140,560
Fair Value Maturities:
Within 1 year	120,303		120,303
Between 1 to 2 years	17,861		17,861
Total investments available for sale	138,164		138,164
Corporate bonds
Investments
Amortized Cost	138,959		138,959		207,917
Gross Unrealized Gain					3
Gross Unrealized Loss	(2,367)		(2,367)		(666)
Estimated Fair Value	136,592		136,592		$ 207,254
U.S. Government agencies
Investments
Amortized Cost	1,601		1,601
Gross Unrealized Loss	(29)		(29)
Estimated Fair Value	$ 1,572		$ 1,572

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