Cash, cash equivalents and marketable securities (Tables)

9 Months Ended

Sep. 30, 2013

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 September 30, 2013 and December 31, 2012 (in thousands):

	Amortized Cost
September 30, 2013
Cash and cash equivalents:
Cash	$	2,093	$	—	$	—		$	2,093
Money market funds		9,598		—		—			9,598
U.S. government agency securities		500		—		—			500
Total cash and cash equivalents		12,191		—		—			12,191
Marketable securities available-for-sale:
U.S. treasury securities		2,500		—		—			2,500
U.S. government agency securities		61,761		22		—			61,783
Total marketable securities available-for-sale		64,261		22		—			64,283
Total cash, cash equivalents and marketable securities	$	76,452	$	22	$	—		$	76,474
December 31, 2012
Cash and cash equivalents:
Cash	$	1,542	$	—	$	—		$	1,542
Money market funds		3,140		—		—			3,140
Municipal securities		2,202		—		—			2,202
U.S. government agency securities		715		—		—			715
Total cash and cash equivalents		7,599		—		—			7,599
Marketable securities available-for-sale:
U.S. government agency securities		116,986		46		(1	)		117,031
U.S. treasury securities		500		—		—			500
Total marketable securities available-for-sale		117,486		46		(1	)		117,531
Total cash, cash equivalents and marketable securities	$	125,085	$	46	$	(1	)	$	125,130

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

The following is a summary of the amortized cost and estimated fair value of marketable securities available-for-sale, by contractual maturity (in thousands):

	September 30, 2013
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	55,761	$	55,778
Mature after one year through two years		8,500		8,505
	$	64,261	$	64,283

- 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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