Available-for-sale Securities (Tables)

3 Months Ended

Mar. 31, 2014

The following is a summary of available-for-sale securities at March 31, 2014 (in thousands):


	March 31, 2014
	Carrying Value		Gross Unrealized Gain		Fair Value
Money market funds	$	9,648	$	0	$	9,648
Corporate debt securities		20,243		8		20,251
United States government agency securities		4,012		0		4,012

Total available-for-sale securities	$	33,903	$	8	$	33,911

The following is a summary of available-for-sale securities at December 31, 2013 (in thousands):


	December 31, 2013
	Carrying Value		Gross Unrealized Gain			Fair Value
Money market funds	$	8,650	$	0		$	8,650
Corporate debt securities		23,165		8			23,173
United States government agency securities		5,019		(1	)		5,018

Total available-for-sale securities	$	36,834	$	7		$	36,841

Available-for-sale securities at March 31, 2014 and December 31, 2013 consisted of the following by original contractual maturity (in thousands):


	March 31, 2014				December 31, 2013
	Carrying Value		Fair Value		Carrying Value		Fair Value
Due in one year or less	$	33,903	$	33,911	$	30,700	$	30,701
Due greater than one year and less than three years		0		0		6,134		6,140

Total cash equivalents and short-term investments	$	33,903	$	33,911	$	36,834	$	36,841