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Marketable Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 89,268,000	$ 36,250,000
Gross Unrealized Gains	26,000	17,000
Gross Unrealized Losses	(10,000)	0
Fair Value	89,284,000	36,267,000
Allowance for credit loss related to available-for-sale debt securities		0
Losses related to other-than-temporary impairments of available-for-sale debt securities	0
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		6,999,000
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		6,999,000
Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,216,000	8,511,000
Gross Unrealized Gains	6,000	3,000
Gross Unrealized Losses	0	0
Fair Value	13,222,000	8,514,000
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	76,052,000	20,740,000
Gross Unrealized Gains	20,000	14,000
Gross Unrealized Losses	(10,000)	0
Fair Value	$ 76,062,000	$ 20,754,000

X

- 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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