Cash, Money Market Funds and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2012

Cash, Money Market Funds, and Marketable Securities

Schedule of cash, money market funds and marketable securities

Cash and available for sale securities consisted of the following as of December 31, 2011 and December 31, 2012 (in thousands):

	As of December 31, 2011
	Cost		Unrealized Gain		Unrealized Loss			Fair Value
Cash balances	$	25,668	$	—	$	—		$	25,668
U.S. government agency securities		2,000		—		—			2,000
Corporate debt securities		13,943		—		(8	)		13,935
Commercial paper		13,737		12		—			13,749
Certificate of deposit		350		—		—			350
	$	55,698	$	12	$	(8	)	$	55,702
Included in cash and cash equivalents	$	25,668	$	—	$	—		$	25,668
Included in marketable securities		30,030		12		(8	)		30,034
Total cash and marketable securities	$	55,698	$	12	$	(8	)	$	55,702

	As of December 31, 2012
	Cost		Unrealized Gain		Unrealized Loss			Fair Value
Cash balances	$	33,971	$	—	$	—		$	33,971
Corporate debt securities		42,503		5		(11	)		42,497
Commercial paper		19,725		19		—			19,744
Certificate of deposit		2,909		1		—			2,910
	$	99,108	$	25	$	(11	)	$	99,122
Included in cash and cash equivalents	$	33,971	$	—	$	—		$	33,971
Included in marketable securities		65,137		25		(11	)		65,151
Total cash and marketable securities	$	99,108	$	25	$	(11	)	$	99,122