Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2014

The following table represents the Company's fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis (in thousands):

	Fair Value at September 30, 2014						Fair Value at December 31, 2013
Assets	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Auction rate security	$	―	$	―	$	—	$	1,790	$	―	$	—
Money market funds		20,736		―		—		100,049		—		—
Government-backed security		—		10,000		—		―		—		—
Asset-backed securities		—		50,300		—		—		—		—
Corporate debt securities		—		105,506		—		—		26,978		—
Total cash equivalents and investments	$	20,736	$	165,806	$	—	$	101,839	$	26,978	$	—