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Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities

At December 31, 2017, marketable securities consisted of the following (in thousands):

						Amortized Cost						Unrealized Gains						Unrealized Losses						Aggregate Fair Value
U.S. treasury debt securities						$	3,083					$	—					$	(8)					$	3,075
U.S. corporate debt securities						13,350						—						(61)						13,289
Money market funds						49,452						—						—						49,452
						$	65,885					$	—					$	(69)					$	65,816
Included in cash and cash equivalents						$	49,452					$	—					$	—					$	49,452
Included in marketable securities						$	16,433					$	—					$	(69)					$	16,364

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 December 31, 2017, marketable securities consisted of the following (in thousands):

						Amortized Cost						Unrealized Gains						Unrealized Losses						Aggregate Fair Value
U.S. treasury debt securities						$	3,083					$	—					$	(8)					$	3,075
U.S. corporate debt securities						13,350						—						(61)						13,289
Money market funds						49,452						—						—						49,452
						$	65,885					$	—					$	(69)					$	65,816
Included in cash and cash equivalents						$	49,452					$	—					$	—					$	49,452
Included in marketable securities						$	16,433					$	—					$	(69)					$	16,364

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 December 31, 2017, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in thousands):

						As of December 31, 2017
						Less than 12 months												12 months or greater
						Fair Value						Unrealized Loss						Fair Value						Unrealized Loss
U.S. treasury debt securities						$	1,976					$	(7)					$	1,099					$	(1)
U.S. corporate debt securities						13,289						(61)						—						—
Total						$	15,265					$	(68)					$	1,099					$	(1)

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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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