Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2014

Fair Value Measurements

Schedule of financial assets subject to fair value measurements

	As of June 30, 2014		Level 1		Level 2		Level 3
	(In thousands)
Money market funds and cash equivalents	$	30,885	$	—	$	30,885	$	—
Marketable securities	211,572		—		211,572		—
	$	242,457	$	—	$	242,457	$	—

	As of December 31, 2013		Level 1		Level 2		Level 3
	(In thousands)
Money market funds and cash equivalents	$	148,549	$	—	$	148,549	$	—
Marketable securities	133,581		—		133,581		—
	$	282,130	$	—	$	282,130	$	—