Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

Summary of Financial Assets, and Liabilities, Allocated into Level 1, Level 2, and Level 3 Measured on Recurring Basis

The following table sets forth the fair value of our financial assets and liabilities, allocated into Level 1, Level 2, and Level 3, that was measured on a recurring basis (in thousands):

	March 31, 2014
	Level 1		Level 2		Level 3		Total
Financial Assets:
Money market funds	$	25,344	$	—	$	—	$	25,344
Corporate notes and commercial paper		—		176,478		—		176,478
U.S. government agency securities		—		78,031		—		78,031
Foreign currency forward contracts		—		245		—		245
Total financial assets	$	25,344	$	254,754	$	—	$	280,098

	December 31, 2013
	Level 1		Level 2		Level 3		Total
Financial Assets:
Money market funds	$	57,296	$	—	$	—	$	57,296
Corporate notes and commercial paper		—		182,472		—		182,472
U.S. government agency securities		—		75,289		—		75,289
Foreign currency forward contracts		—		372		—		372
Total financial assets	$	57,296	$	258,133	$	—	$	315,429