Cash, Money Market Funds and Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2013

Cash, Money Market Funds and Marketable Securities

Schedule of cash and available for sale securities

Cash and available-for-sale securities consisted of the following as of December 31, 2012 and March 31, 2013 (in thousands):

	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 available for sale securities	$	99,108	$	25	$	(11	)	$	99,122

	As of March 31, 2013
	Cost		Unrealized Gain		Unrealized Loss			Fair Value
Cash balances	$	26,736	$	—	$	—		$	26,736
Corporate debt securities	35,934		3		(13		)	35,924
Commercial paper	21,716		25		—			21,741
Certificate of deposit	350		—		—			350
	$	84,736	$	28	$	(13	)	$	84,751
Included in cash and cash equivalents	$	26,736	$	—	$	—		$	26,736
Included in marketable securities	58,000		28		(13		)	58,015
Total cash and available for sale securities	$	84,736	$	28	$	(13	)	$	84,751

Schedule of changes in AOCI associated with the unrealized holding gain on available-for-sale investments

The changes in AOCI associated with the unrealized holding gain on available-for-sale investments during the three months ended March 31, 2012 and 2013, were as follows (in thousands):

	Three Months Ended March 31,
	2012		2013
Balance, beginning	$	4	$	14
Current period changes in fair value, (a)	33		1
Reclassification of earnings, (a)	—		—
Balance, ending	$	37	$	15

(a) — Taxes have not been accrued on the unrealized gain on securities as the Company is in a loss position for all periods presented.