Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Cash and Cash Equivalents and Marketable Securities, Measured at Fair Value on Recurring Basis

The Company’s cash equivalents and marketable securities that are measured at fair value on a recurring basis are classified as follows (in thousands):

	March 31, 2013						December 31, 2012
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	(unaudited)
Cash and Cash Equivalents:
Money market funds	$	36,575	$	—	$	—	$	14,055	$	—	$	—
U.S. Agency notes		—		3,766		—		—		150		—
Corporate bonds		—		2,112		—		—		1,400		—
Commercial paper		—		6,549		—		—		—		—
Marketable Securities:
U.S. Agency notes		—		13,246		—		—		3,857		—
Corporate bonds		—		27,749		—		—		11,126		—
Commercial paper		—		9,542		—		—		9,142		—
	$	36,575	$	62,964	$	—	$	14,055	$	25,675	$	—