Marketable Securities (Tables)

9 Months Ended

Sep. 30, 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):

	September 30, 2014
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Corporate bonds	$	69,856	$	33	$	(90	)	$	69,799
Asset-backed securities	56,285		13		(36		)	56,262
Commercial paper	30,596		2		—			30,598
Mortgage-backed securities	21,348		31		(81		)	21,298
Government and agency securities	9,208		7		(5		)	9,210
Municipal bonds	2,704		5		—			2,709
Total	$	189,997	$	91	$	(212	)	$	189,876

	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 September 30, 2014 and December 31, 2013 (in thousands):

	September 30, 2014				December 31, 2013
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Marketable securities
Due in 1 year or less	$	62,295	$	62,305	$	59,384	$	59,448
Due in 1-2 years	53,133		53,116		21,628		21,641
Due in 2-3 years	36,349		36,300		10,063		10,060
Due in 3-4 years	10,958		10,961		—		—
Due in 4-9 years	10,404		10,402		7,587		7,610
Due in 9-20 years	1,350		1,361		1,629		1,639
Due in 20-33 years	15,508		15,431		12,167		12,146
	$	189,997	$	189,876	$	112,458	$	112,544