Short-term Investments (Tables)

9 Months Ended

Sep. 30, 2013

Marketable Securities Measured at Fair Value

As of September 30, 2013, the Company’s short-term investments were $94.7 million, consisting of certificates of deposit of $3.0 million and marketable securities measured at fair value as follows (in thousands):

	Amortized cost		Unrealized gains		Unrealized loss			Fair value
	(unaudited)
U.S. Agency notes	$	20,966	$	3	$	(1	)	$	20,968
Corporate bonds		43,521		3		(13	)		43,511
Commercial paper		27,216		3		—			27,219
Total Marketable Securities	$	91,703	$	9	$	(14	)	$	91,698

As of December 31, 2012, the Company’s short-term investments were $25.1 million, consisting of certificates of deposit of $1.0 million and marketable securities measured at fair value as follows (in thousands):

	December 31, 2012
	Amortized cost		Unrealized gains		Unrealized loss			Fair value
U.S. Agency notes	$	3,856	$	1	$	—		$	3,857
Corporate bonds		11,128		1		(3	)		11,126
Commercial paper		9,142		—		—			9,142
Total Marketable Securities	$	24,126	$	2	$	(3	)	$	24,125