Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2014

Investments Debt And Equity Securities [Abstract]

Summary of Available-for-Sale Marketable Securities

Available-for-sale marketable securities at September 30, 2014:

	Amortized		Gross		Gross			Estimated
	Cost		Unrealized		Unrealized			Fair
	Basis		Gains		Losses			Value
Corporate bonds	$	29,296	$	20	$	(43	)	$	29,273
Mortgage-backed and asset-backed securities		1,534		1		(3	)		1,532
Agency bonds		300		—		(1	)		299
Total marketable securities	$	31,130	$	21	$	(47	)	$	31,104

Available-for-sale marketable securities at December 31, 2013:

	Amortized		Gross		Gross			Estimated
	Cost		Unrealized		Unrealized			Fair
	Basis		Gains		Losses			Value
Corporate bonds	$	18,798	$	41	$	(6	)	$	18,833
Mortgage-backed and asset-backed securities		1,170		1		—			1,171
Total marketable securities	$	19,968	$	42	$	(6	)	$	20,004

Summary of Available-for-Sale Marketable Securities by Contractual Maturity

The following table summarizes the estimated fair value of available-for-sale marketable securities by contractual maturity at September 30, 2014:

	Fair Value
Due within 1 year or less	$	11,353
Due after 1 through 5 years		18,219
Mortgage-backed securities not due in a single maturity date		1,532
	$	31,104

The following table summarizes the estimated fair value of available-for-sale marketable securities by contractual maturity at December 31, 2013:

	Fair Value
Due within 1 year or less	$	6,248
Due after 1 through 5 years		13,449
Mortgage-backed securities not due in a single maturity date		307
	$	20,004