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Marketable Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 89,268,000	$ 77,721,000
Gross Unrealized Gains	26,000	99,000
Gross Unrealized Losses	(10,000)	(27,000)
Fair Value	89,284,000	77,793,000
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
Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,216,000	13,713,000
Gross Unrealized Gains	6,000	35,000
Gross Unrealized Losses	0	0
Fair Value	13,222,000	13,748,000
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	76,052,000	64,008,000
Gross Unrealized Gains	20,000	64,000
Gross Unrealized Losses	(10,000)	(27,000)
Fair Value	$ 76,062,000	$ 64,045,000

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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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