(3) Cash, Cash Equivalents and Marketable Securities

A summary of cash, cash equivalents and available-for-sale marketable securities held by the Company as of June 30, 2014 and December 31, 2013 was as follows (see Note 2):

	June 30, 2014
	Cost		Unrealized gains		Unrealized losses		Fair value
	(in thousands)
Cash and cash equivalents:
Cash and money market funds (Level 1)	$	90,585	$	—	$	—	$	90,585
Corporate debt securities due within 3 months of date of purchase (Level 2)	6,226		—		—		6,226
Total cash and cash equivalents	$	96,811	$	—	$	—	$	96,811
Marketable securities:
Corporate debt securities due within 1 year of date of purchase (Level 2)	15,246		3		—		15,249
Total cash, cash equivalents and marketable securities	$	112,057	$	3	$	—	$	112,060

	December 31, 2013
	Cost		Unrealized gains		Unrealized losses			Fair value
	(in thousands)
Cash and cash equivalents:
Cash and money market funds (Level 1)	$	40,586	$	—	$	—		$	40,586
Corporate debt securities due within 3 months of date of purchase (Level 2)	7,904		—		—			7,904
Total cash and cash equivalents	$	48,490	$	—	$	—		$	48,490
Marketable securities:
Corporate debt securities due within 1 year of date of purchase (Level 2)	42,969		18		(1		)	42,986
Total cash, cash equivalents and marketable securities	$	91,459	$	18	$	(1	)	$	91,476