Marketable Securities

9 Months Ended

Sep. 30, 2015

Available For Sale Securities [Abstract]

Marketable Securities

5. Marketable Securities

Available-for-sale marketable securities at September 30, 2015:

	Amortized		Gross		Gross			Estimated
	Cost		Unrealized		Unrealized			Fair
	Basis		Gains		Losses			Value
Corporate bonds	$	19,417	$	8	$	(30	)	$	19,395
Treasury bonds		3,281		—		(2	)		3,279
Mortgage-backed and asset-backed securities		2,670		1		(3	)		2,668
Agency bonds		803		1		—			804
Total marketable securities	$	26,171	$	10	$	(35	)	$	26,146

The following table summarizes the estimated fair value of available-for-sale marketable securities by contractual maturity at September 30, 2015:

	Fair Value
Due within 1 year or less	$	11,067
Due after 1 through 5 years		14,529
Mortgage-backed securities not due in a single maturity date		550
	$	26,146

Available-for-sale marketable securities at December 31, 2014:

	Amortized		Gross		Gross			Estimated
	Cost		Unrealized		Unrealized			Fair
	Basis		Gains		Losses			Value
Corporate bonds	$	21,748	$	6	$	(50	)	$	21,704
Mortgage-backed and asset-backed securities		1,226		—		(3	)		1,223
Agency bonds		300		—		(1	)		299
Total marketable securities	$	23,274	$	6	$	(54	)	$	23,226

The following table summarizes the estimated fair value of available-for-sale marketable securities by contractual maturity at December 31, 2014:

	Fair Value
Due within 1 year or less	$	7,483
Due after 1 through 5 years		14,520
Mortgage-backed securities not due in a single maturity date		1,223
	$	23,226