Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2015

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, 2015
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Corporate bonds	$	31,224	$	11	$	(41	)	$	31,194
Asset-backed securities	21,020		3		(13		)	21,010
Government and agency securities	7,709		34		—			7,743
Mortgage-backed securities	6,253		9		(26		)	6,236
Municipal bonds	2,817		3		—			2,820
Total	$	69,023	$	60	$	(80	)	$	69,003

	December 31, 2014
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Corporate bonds	$	62,208	$	16	$	(134	)	$	62,090
Asset-backed securities	49,343		5		(38		)	49,310
Mortgage-backed securities	19,280		25		(114		)	19,191
Commercial paper	18,698		2		—			18,700
Government and agency securities	11,868		14		(4		)	11,878
Municipal bonds	3,448		3		(1		)	3,450
Total	$	164,845	$	65	$	(291	)	$	164,619

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 maturity as of September 30, 2015 and December 31, 2014 (in thousands):

	September 30, 2015				December 31, 2014
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Marketable securities
Due in 1 year or less	$	24,988	$	24,988	$	46,759	$	46,754
Due in 1-2 years	21,579		21,583		53,698		53,639
Due in 2-3 years	10,674		10,673		30,558		30,505
Due in 3-4 years	3,467		3,463		11,277		11,275
Due in 4-9 years	3,497		3,497		7,280		7,275
Due in 9-20 years	1,460		1,464		1,257		1,266
Due in 20-35 years	3,358		3,335		14,016		13,905
	$	69,023	$	69,003	$	164,845	$	164,619