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Marketable Securities - Schedule of Fair Value Marketable Securities By Type of Security (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Marketable Securities [Line Items]
Amortized Cost	$ 93,532	$ 101,027
Unrealized Gains	109
Unrealized Losses		(41)
Fair Value	93,641	100,986
U.S. Government Agency Securities and Treasuries
Marketable Securities [Line Items]
Amortized Cost	93,532	101,027
Unrealized Gains	109
Unrealized Losses		(41)
Fair Value	$ 93,641	$ 100,986

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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