Marketable Securities

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

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

At December 31, 2014, we reported money market funds with an amortized cost and aggregate fair value of $97.1 million in cash and cash equivalents.

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	)	$	—	$	—

As of December 31, 2014, we did not have any marketable securities in an unrealized loss position.

We did not believe any of the unrealized losses represented an other-than-temporary impairment based on our evaluation of available evidence, which includes our intent as of December 31, 2015 to hold these investments until the cost basis is recovered.