Marketable Securities - Schedule of Available for Sale (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Amortized Cost	$ 15,992
Gross Unrealized Gains
Gross Unrealized Losses	(12)
Fair Value	15,980
Marketable securities	15,980
Less Than Twelve Months [Member]
Gross Unrealized Gains
Fair Value	1,144
12 Months or More [Member]
Gross Unrealized Gains	63
Fair Value	14,836
U.S. Treasury Notes [Member]
Amortized Cost	5,641
Gross Unrealized Gains
Gross Unrealized Losses	(23)
Fair Value	5,618
Marketable securities	5,618
U.S. Treasury Notes [Member] | Less Than Twelve Months [Member]
Gross Unrealized Gains
Fair Value	1,008
U.S. Treasury Notes [Member] | 12 Months or More [Member]
Gross Unrealized Gains	(23)
Fair Value	4,610
U.S. Government Mortgage Backed Securities [Member]
Amortized Cost	4,748
Gross Unrealized Gains
Gross Unrealized Losses	(27)
Fair Value	4,721
Marketable securities	4,721
U.S. Government Mortgage Backed Securities [Member] | Less Than Twelve Months [Member]
Gross Unrealized Gains
Fair Value
U.S. Government Mortgage Backed Securities [Member] | 12 Months or More [Member]
Gross Unrealized Gains	(27)
Fair Value	4,721
Corporate Bonds [Member]
Amortized Cost	5,603
Gross Unrealized Gains
Gross Unrealized Losses	38
Fair Value	5,641
Marketable securities	5,641
Corporate Bonds [Member] | Less Than Twelve Months [Member]
Gross Unrealized Gains
Fair Value	136
Corporate Bonds [Member] | 12 Months or More [Member]
Gross Unrealized Gains	38
Fair Value	$ 5,505