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Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Marketable Securities

Available-for-sale marketable securities as of September 30, 2018 and December 31, 2017 were as follows (in thousands):

			September 30, 2018
			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
U.S. Treasury securities			$	3,996					$	—					$	—					$	3,996
Government-sponsored enterprises			5,477						—						—						5,477
Corporate debt securities			48,863						2						(2)						48,863
Total			$	58,336					$	2					$	(2)					$	58,336

			December 31, 2017
			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
U.S. Treasury securities			$	3,995					$	—					$	(6)					$	3,989
Government-sponsored enterprises			11,998						—						(7)						11,991
Corporate debt securities			77,462						2						(50)						77,414
Total			$	93,455					$	2					$	(63)					$	93,394

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- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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