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Marketable Securities (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 58,336,000	$ 93,455,000
Gross Unrealized Gains	2,000	2,000
Gross Unrealized Losses	(2,000)	(63,000)
Fair Value	58,336,000	93,394,000
Other-than-temporary unrealized losses	0	0
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,996,000	3,995,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(6,000)
Fair Value	3,996,000	3,989,000
Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,477,000	11,998,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(7,000)
Fair Value	5,477,000	11,991,000
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	48,863,000	77,462,000
Gross Unrealized Gains	2,000	2,000
Gross Unrealized Losses	(2,000)	(50,000)
Fair Value	$ 48,863,000	$ 77,414,000

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).

+ References

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