Fair Value (Tables)

9 Months Ended

Sep. 30, 2014

Financial assets measured at fair value on a recurring basis

Financial assets (excluding cash balances) measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013 are summarized as follows (in thousands):



	As of September 30, 2014								As of December 31, 2013
	Fair Value Measurement Using								Fair Value Measurement Using
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	797	$	—	$	—	$	797	$	751	$	—	$	—	$	751
Total cash equivalents	797		—		—		797		751		—		—		751
Commercial paper and corporate bonds	—		417,350		—		417,350		—		378,061		—		378,061
U.S. government agency debt securities	—		—		—		—		—		35,936		—		35,936
Total marketable securities	—		417,350		—		417,350		—		413,997		—		413,997
Total financial assets	$	797	$	417,350	$	—	$	418,147	$	751	$	413,997	—		$	414,748