Fair Value of Financial Insturments (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The Company’s assets that are measured at fair value on a recurring basis, by level, within the fair value hierarchy as of September 30, 2014 and December 31, 2013, are summarized as follows (in thousands):

	September 30, 2014						December 31, 2013
	Level 1		Level 2		Total		Level 1		Level 2		Total
Assets
Money market funds	$	6,775	$	—	$	6,775	$	22,991	$	—	$	22,991
Commercial paper	—		1,599		1,599		—		900		900
U.S. government agency securities	—		8,505		8,505		—		11,279		11,279
U.S. Treasury securities	—		3,554		3,554		—		5,235		5,235
Municipal debt securities	—		3,948		3,948		—		4,765		4,765
Corporate debt securities	—		83,041		83,041		—		67,055		67,055
Total assets measured at fair value	$	6,775	$	100,647	$	107,422	$	22,991	$	89,234	$	112,225