Cash Equivalents and Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2015

Cash Equivalents and Marketable Securities

Schedule of marketable securities

Marketable securities at March 31, 2015 are summarized as follows (in thousands):

					Gross			Gross
					Unrealized			Unrealized
			Gross		Losses			Losses
	Amortized		Unrealized		Less than			12 Months		Aggregate
	Cost		Gains		12 Months			or Longer		Fair Value
Balance at March 31, 2015
Corporate debt securities	$	2,942	$	—	$	(39	)	$	—	$	2,903
U.S. government debt securities	744		—		(14		)	—		730
Municipal bonds	668		—		(5		)	—		663
Total	$	4,354	$	—	$	(58	)	$	—	$	4,296

Marketable securities at December 31, 2014 are summarized as follows (in thousands):

					Gross		Gross
					Unrealized		Unrealized
			Gross		Losses		Losses
	Amortized		Unrealized		Less than		12 Months			Aggregate
	Cost		Gains		12 Months		or Longer			Fair Value
Balance at December 31, 2014
Corporate debt securities	$	7,184	$	—	$	—	$	(22	)	$	7,162
U.S. government debt securities	1,347		—		—		(6		)	1,341
Municipal bonds	671		—		—		(2		)	669
Total	$	9,202	$	—	$	—	$	(30	)	$	9,172

Schedule of marketable securities with unrealized losses by contractual maturity dates

The following table summarizes the contractual maturities of marketable securities at March 31, 2015 (in thousands):

	Amortized		Aggregate
	Cost		Fair Value
Matures in less than one year	$	4,354	$	4,296
Matures in one to three years	—		—
Total	$	4,354	$	4,296