Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities

At December 31, 2015, marketable securities consisted of the following (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Aggregate Fair Value
U.S. treasury debt securities	$	4,805	$	—	$	(31	)	$	4,774
U.S. corporate debt securities	12,679		1		(34		)	12,646
Money market funds	53,365		—		—			53,365
	$	70,849	$	1	$	(65	)	$	70,785
Included in cash and cash equivalents	$	53,365	$	—	$	—		$	53,365
Included in marketable securities	$	17,484	$	1	$	(65	)	$	17,420

Schedule of Cash and Cash Equivalents

At December 31, 2015, marketable securities consisted of the following (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Aggregate Fair Value
U.S. treasury debt securities	$	4,805	$	—	$	(31	)	$	4,774
U.S. corporate debt securities	12,679		1		(34		)	12,646
Money market funds	53,365		—		—			53,365
	$	70,849	$	1	$	(65	)	$	70,785
Included in cash and cash equivalents	$	53,365	$	—	$	—		$	53,365
Included in marketable securities	$	17,484	$	1	$	(65	)	$	17,420

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, 2015, 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, 2015
	Less than 12 months					12 months or greater
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
U.S. treasury debt securities	$	4,774	$	(31	)	$	—	$	—
U.S. corporate debt securities	10,104		(34		)	—		—
Total	$	14,878	$	(65	)	$	—	$	—