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Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities

At September 30, 2017, marketable securities consisted of the following (in thousands):

			Amortized Cost						Unrealized Gains						Unrealized Losses						Aggregate Fair Value
U.S. treasury debt securities			$	2,888					$	—					$	(3)					$	2,885
U.S. corporate debt securities			12,161						1						(14)						12,148
Money market funds			52,027						—						—						52,027
			$	67,076					$	1					$	(17)					$	67,060
Included in cash and cash equivalents			$	52,027					$	—					$	—					$	52,027
Included in marketable securities			$	15,049					$	1					$	(17)					$	15,033

At December 31, 2016, marketable securities consisted of the following (in thousands):

			Amortized Cost						Unrealized Gains						Unrealized Losses						Aggregate Fair Value
U.S. treasury debt securities			$	3,503					$	—					$	(5)					$	3,498
U.S. corporate debt securities			7,943						1						(7)						7,937
Money market funds			43,496						—						—						43,496
			$	54,942					$	1					$	(12)					$	54,931
Included in cash and cash equivalents			$	43,496					$	—					$	—					$	43,496
Included in marketable securities			$	11,446					$	1					$	(12)					$	11,435

Schedule of Cash and Cash Equivalents

At September 30, 2017, marketable securities consisted of the following (in thousands):

			Amortized Cost						Unrealized Gains						Unrealized Losses						Aggregate Fair Value
U.S. treasury debt securities			$	2,888					$	—					$	(3)					$	2,885
U.S. corporate debt securities			12,161						1						(14)						12,148
Money market funds			52,027						—						—						52,027
			$	67,076					$	1					$	(17)					$	67,060
Included in cash and cash equivalents			$	52,027					$	—					$	—					$	52,027
Included in marketable securities			$	15,049					$	1					$	(17)					$	15,033

At December 31, 2016, marketable securities consisted of the following (in thousands):

			Amortized Cost						Unrealized Gains						Unrealized Losses						Aggregate Fair Value
U.S. treasury debt securities			$	3,503					$	—					$	(5)					$	3,498
U.S. corporate debt securities			7,943						1						(7)						7,937
Money market funds			43,496						—						—						43,496
			$	54,942					$	1					$	(12)					$	54,931
Included in cash and cash equivalents			$	43,496					$	—					$	—					$	43,496
Included in marketable securities			$	11,446					$	1					$	(12)					$	11,435

Schedule of Available-for-sale Securities, Continuous Unrealized Loss Position

The following table presents gross unrealized losses and fair values for those marketable securities that were in an unrealized loss position as of September 30, 2017, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in thousands):

			As of September 30, 2017
			Less than 12 months												12 months or greater
			Fair Value						Unrealized Loss						Fair Value						Unrealized Loss
U.S. treasury debt securities			$	2,885					$	(3)					$	—					$	—
U.S. corporate debt securities			9,884						(14)						—						—
Total			$	12,769					$	(17)					$	—					$	—

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
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