Available-for-sale Securities (Tables)

12 Months Ended

Dec. 31, 2013

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	$	—		$	8,650
United States government agency securities		5,019		(1	)		5,018
Corporate debt securities		23,165		8			23,173

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

The following is a summary of available-for-sale securities at December 31, 2012 (in thousands):


	December 31, 2012
	Carrying Value		Gross Unrealized Gain		Fair Value
Money market funds	$	10,268	$	—	$	10,268

Total available-for-sale securities	$	10,268	$	—	$	10,268

Available-for-sale securities at December 31, 2013 and 2012 consisted of the following by original contractual maturity (in thousands):


	December 31, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
Due in one year or less	$	30,700	$	30,701	$	10,268	$	10,268
Due greater than one year and less than five years		6,134		6,140		—		—

Total available-for-sale securities	$	36,834	$	36,841	$	10,268	$	10,268