Available-for-sale Securities (Tables)

9 Months Ended

Sep. 30, 2014

Summary of Available for Sale Securities

The following is a summary of available-for-sale securities at September 30, 2014 (in thousands):

	September 30, 2014
	Carrying Value		Net   Unrealized Gain		Fair Value
Money market funds	$	6,185	$	0	$	6,185
Corporate debt securities		21,813		(11)		21,802
United States government agency securities		3,429		0		3,429
Total available-for-sale securities	$	31,427	$	(11)	$	31,416

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

	December 31, 2013
	Carrying Value		Net 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 by Original Contractual Maturity

Available-for-sale securities at September 30, 2014 and December 31, 2013, consisted of the following by original contractual maturity (in thousands):

	September 30, 2014				December 31, 2013
	Carrying Value		Fair Value		Carrying Value		Fair Value
Due in one year or less	$	29,396	$	29,389	$	30,700	$	30,701
Due greater than one year and less than three years		2,031		2,027		6,134		6,140
Total cash equivalents and short-term investments	$	31,427	$	31,416	$	36,834	$	36,841