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Marketable Securities (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 91,786,000
Gross Unrealized Gains	34,000
Gross Unrealized Losses	0
Fair Value	91,820,000
Other-than-temporary unrealized losses	0	$ 0
Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,919,000
Gross Unrealized Gains	8,000
Gross Unrealized Losses	0
Fair Value	20,927,000
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	70,867,000	12,738,000
Gross Unrealized Gains	26,000	0
Gross Unrealized Losses	0	(3,000)
Fair Value	$ 70,893,000	$ 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).

+ References

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Amount of 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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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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