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Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 93,455	$ 200,966
Gross Unrealized Gains	2	56
Gross Unrealized Losses	(63)	(138)
Fair Value	93,394	200,884
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,995	4,826
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6)	(1)
Fair Value	3,989	4,825
Government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,998	29,764
Gross Unrealized Gains	0	5
Gross Unrealized Losses	(7)	(10)
Fair Value	11,991	29,759
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	77,462	166,376
Gross Unrealized Gains	2	51
Gross Unrealized Losses	(50)	(127)
Fair Value	$ 77,414	$ 166,300

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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