Cash, Cash Equivalents and Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2014

Summary of Cash, Cash Equivalents and Marketable Securities Available-for-Sale

The following is a summary of cash, cash equivalents and marketable securities available-for-sale as of March 31, 2014 and December 31, 2013 (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
March 31, 2014
Cash and cash equivalents:
Cash	$	1,554	$	-	$	-		$	1,554
Money market funds		25,196		-		-			25,196
Total cash and cash equivalents		26,750		-		-			26,750
Marketable securities available-for-sale:
U.S. government agency securities		150,891		47		(9	)		150,929
Total marketable securities available-for-sale		150,891		47		(9	)		150,929
Total cash, cash equivalents and marketable securities	$	177,641	$	47	$	(9	)	$	177,679
December 31, 2013
Cash and cash equivalents:
Cash	$	1,766	$	-	$	-		$	1,766
Money market funds		20,013		-		-			20,013
U.S. government agency securities		1,343		-		-			1,343
Total cash and cash equivalents		23,122		-		-			23,122
Marketable securities available-for-sale:
U.S. government agency securities		166,285		16		(47	)		166,254
Total marketable securities available-for-sale		166,285		16		(47	)		166,254
Total cash, cash equivalents and marketable securities	$	189,407	$	16	$	(47	)	$	189,376

Summary of Amortized Cost and Estimated Fair Value of Marketable Securities Available-for-Sale

The maturities of our marketable securities available-for-sale are as follows (in thousands):

	March 31, 2014
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	86,050	$	86,070
Mature after one year through two years		64,841		64,859
	$	150,891	$	150,929

- 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.

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