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Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 22,503	$ 29,907
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Fair Value	22,502	29,907
Money market mutual funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,507	29,907
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	7,507	$ 29,907
United States treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,996
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Fair Value	$ 14,995

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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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