Available-for-sale Securities (Tables)

3 Months Ended

Mar. 31, 2015

The following is a summary of available-for-sale securities at March 31, 2015 (in thousands):


	March 31, 2015
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Money market funds	$	5,512	$	0	$	0		$	5,512
United States government agency securities		73,412		1		(6	)		73,407
Corporate debt securities		20,559		3		(10	)		20,552

Total available-for-sale securities	$	99,483	$	4	$	(16	)	$	99,471

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


	December 31, 2014
	Amortized Cost		Gross Unrealized Loss			Fair Value
Money market funds	$	3,912	$	0		$	3,912
United States government agency securities		3,427		(1	)		3,426
Corporate debt securities		26,118		(30	)		26,088

Total available-for-sale securities	$	33,457	$	(31	)	$	33,426

Available-for-sale securities at March 31, 2015 and December 31, 2014, consisted of the following by original contractual maturity (in thousands):


	March 31, 2015				December 31, 2014
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
One year or less	$	99,483	$	99,471	$	27,752	$	27,727
Greater than one year and less than five years		0		0		5,705		5,699

Total available-for-sale securities	$	99,483	$	99,471	$	33,457	$	33,426