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Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 91,407	$ 89,268
Gross Unrealized Gains	3	26
Gross Unrealized Losses	(10)	(10)
Fair Value	91,400	89,284
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	60,630
Gross Unrealized Gains	1
Gross Unrealized Losses	(7)
Fair Value	60,624
Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		13,216
Gross Unrealized Gains		6
Gross Unrealized Losses		0
Fair Value		13,222
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	30,777	76,052
Gross Unrealized Gains	2	20
Gross Unrealized Losses	(3)	(10)
Fair Value	$ 30,776	$ 76,062

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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