Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Hierarchy For Financial Assets And Liabilities Measured At Fair Value On Recurring Basis

The following table represents the fair value hierarchy for our financial assets (cash equivalents and marketable securities) measured at fair value on a recurring basis as of December 31, 2013 and 2012 (in thousands):

	Level 1		Level 2		Level 3		Total
December 31, 2013
Money market funds	$	20,013	$	-	$	-	$	20,013
U.S. government agency securities		-		167,597		-		167,597
Total	$	20,013	$	167,597	$	-	$	187,610
	Level 1		Level 2		Level 3		Total
December 31, 2012
Money market funds	$	3,140	$	-	$	-	$	3,140
U.S. government agency securities		-		119,233		-		119,233
U.S. treasury securities		-		500		-		500
Municipal securities		-		715		-		715
Total	$	3,140	$	120,448	$	-	$	123,588