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Marketable Securities

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

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

All available-for-sale marketable securities held as of September 30, 2018 had contractual maturities of less than one year. All of the Company's available-for-sale marketable securities in an unrealized loss position as of September 30, 2018 and December 31, 2017 were in a loss position for less than twelve months.  There were no unrealized losses at September 30, 2018 or December 31, 2017 that the Company determined to be other-than-temporary.

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- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-URI http://asc.fasb.org/subtopic&trid=2209399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-URI http://asc.fasb.org/subtopic&trid=2324412

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-URI http://asc.fasb.org/topic&trid=2196928

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-URI http://asc.fasb.org/subtopic&trid=2176304

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