Marketable Securities

3 Months Ended

Mar. 31, 2015

Investments Debt And Equity Securities [Abstract]

Marketable Securities

5. Marketable Securities

Available-for-sale marketable securities at March 31, 2015:

	Amortized		Gross		Gross			Estimated
	Cost		Unrealized		Unrealized			Fair
	Basis		Gains		Losses			Value
Corporate bonds	$	21,503	$	60	$	(17	)	$	21,546
Mortgage-backed and asset-backed securities		968		—		(2	)		966
Agency bonds		300		—		—			300
Total marketable securities	$	22,771	$	60	$	(19	)	$	22,812

The following table summarizes the estimated fair value of available-for-sale marketable securities by contractual maturity at March 31, 2015:

	Fair Value
Due within 1 year or less	$	10,331
Due after 1 through 5 years		11,515
Mortgage-backed securities not due in a single maturity date		966
	$	22,812

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