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Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		$ 93,455
Gross Unrealized Gains		2
Gross Unrealized Losses		(63)
Fair Value		93,394
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		3,995
Gross Unrealized Gains		0
Gross Unrealized Losses		(6)
Fair Value		3,989
Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		11,998
Gross Unrealized Gains		0
Gross Unrealized Losses		(7)
Fair Value		11,991
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 12,738	77,462
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(3)	(50)
Fair Value	$ 12,735	$ 77,414

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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