Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Company's Available-for-Sale Securities by Level within Fair Value Hierarchy

The Company’s available-for-sale securities by level within the fair value hierarchy were as follows:

As of December 31, 2014	Fair value measurement using:
	Level 1		Level 2		Level 3		Total
	(In thousands)
Cash equivalents:
Money market fund	$	13,426	$	—	$	—	$	13,426
Short-term investments:
U.S. government-related debt securities		—		4,498		—		4,498
Corporate debt securities		—		47,307		—		47,307
Asset-backed securities		—		3,197		—		3,197
Total	$	13,426	$	55,002	$	—	$	68,428
As of December 31, 2013	Fair value measurement using:
	Level 1		Level 2		Level 3		Total
	(In thousands)
Cash equivalents:
Money market fund	$	8,454	$	—	$	—	$	8,454
Short-term investments:
U.S. government-related debt securities		—		1,566		—		1,566
Corporate debt securities		—		31,149		—		31,149
Total	$	8,454	$	32,715	$	—	$	41,169