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Marketable Securities (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 86,253,000	$ 86,253,000
Gross Unrealized Gains	25,000	25,000
Gross Unrealized Losses	(2,000)	(2,000)
Fair Value	86,276,000	86,276,000
Other-than-temporary unrealized losses		0	$ 0
Loss on corporate equity securities	7,600,000
Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,690,000	11,690,000
Gross Unrealized Gains	5,000	5,000
Gross Unrealized Losses	0	0
Fair Value	11,695,000	11,695,000
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	74,563,000	74,563,000	12,738,000
Gross Unrealized Gains	20,000	20,000	0
Gross Unrealized Losses	(2,000)	(2,000)	(3,000)
Fair Value	$ 74,581,000	$ 74,581,000	$ 12,735,000

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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