Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2015

Investments, Debt and Equity Securities [Abstract]

At March 31, 2015 and December 31, 2014, respectively, marketable securities consisted of the following (in thousands):



	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
March 31, 2015
U.S. agency obligations	$	153,201	$	12	$	(10	)	$	153,203
U.S. treasury securities	5,526		1		—			5,527
Money market mutual funds	13,199		—		—			13,199
	171,926		13		(10		)	171,929
Included in cash and cash equivalents	13,199		—		—			13,199
Included in marketable securities	$	158,727	$	13	$	(10	)	$	158,730



	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
December 31, 2014
U.S. agency obligations	$	177,297	$	4	$	(44	)	$	177,257
U.S. treasury securities	5,580		1		—			5,581
Money market mutual funds	1,919		—		—			1,919
	184,796		5		(44		)	184,757
Included in cash and cash equivalents	3,480		—		—			3,480
Included in marketable securities	$	175,093	$	5	$	(41	)	$	175,057
Included in marketable securities, noncurrent	$	6,223	$	—	$	(3	)	$	6,220

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References+ Details