Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2014

Cash and Cash Equivalents [Abstract]

Marketable Securities Classified as Available-for-Sale

Marketable securities classified as available-for-sale consisted of the following (in thousands):

	March 31, 2014
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Corporate bonds	$	34,328	$	47	$	(6	)	$	34,369
Asset-backed securities	17,761		15		(2		)	17,774
Mortgage-backed securities	13,528		40		(27		)	13,541
Government and agency securities	8,545		14		(9		)	8,550
Commercial paper	4,596		1		—			4,597
Municipal bonds	3,816		2		(1		)	3,817
Total	$	82,574	$	119	$	(45	)	$	82,648

	December 31, 2013
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Corporate bonds	$	45,414	$	75	$	(7	)	$	45,482
Asset-backed securities	21,222		12		(8		)	21,226
Mortgage-backed securities	15,110		33		(26		)	15,117
Commercial paper	13,890		2		—			13,892
Government and agency securities	12,255		9		—			12,264
Municipal bonds	3,817		—		(4		)	3,813
Certificates of deposit	750		—		—			750
Total	$	112,458	$	131	$	(45	)	$	112,544

Amortized Cost and Fair Value of Marketable Securities Classified by Stated Maturity

The following table summarizes the amortized cost and fair value of the Company’s marketable securities, classified by stated maturity as of March 31, 2014 and December 31, 2013 (in thousands):

	March 31, 2014				December 31, 2013
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Marketable securities
Due in 1 year or less	$	39,302	$	39,347	$	59,384	$	59,448
Due in 1-2 years	12,579		12,591		21,628		21,641
Due in 2-3 years	10,615		10,610		10,063		10,060
Due in 3-4 years	1,526		1,531		—		—
Due in 4-9 years	6,095		6,118		7,587		7,610
Due in 9-20 years	1,534		1,549		1,629		1,639
Due in 20-33 years	10,923		10,902		12,167		12,146
	$	82,574	$	82,648	$	112,458	$	112,544