Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Summary of Fair Value of Financial Assets and Liabilities that are Measured at Fair Value and the Classification by Level of Input within Fair Value Hierarchy

The following tables summarize the fair value of financial assets and liabilities that are measured at fair value and the classification by level of input within the fair value hierarchy:

	FAIR VALUE MEASUREMENTS AS OF JUNE 30, 2015
(in thousands)	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash and money market accounts	$	100,916	$	—	$	—	$	100,916
Total cash and cash equivalents	$	100,916	$	—	$	—	$	100,916
Investments:
Certificates of deposit	$	—	$	27,314	$	—	$	27,314
Commercial paper	—		5,990		—		5,990
Corporate bonds	—		24,179		—		24,179
Government agencies	—		4,530		—		4,530
Total investments	$	—	$	62,013	$	—	$	62,013
Total cash, cash equivalents, and investments	$	100,916	$	62,013	$	—	$	162,929

	FAIR VALUE MEASUREMENTS AS OF DECEMBER 31, 2014
(in thousands)	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash and money market accounts	$	84,613	$	—	$	—	$	84,613
Certificates of deposit	—		472		—		472
Corporate bonds	—		501		—		501
Total cash and cash equivalents	$	84,613	$	973	$	—	$	85,586
Investments:
Certificates of deposit	$	—	$	30,241	$	—	$	30,241
Commercial paper	—		5,986		—		5,986
Corporate bonds	—		30,311		—		30,311
Government agencies	—		6,076		—		6,076
Total investments	$	—	$	72,614	$	—	$	72,614
Total cash, cash equivalents, and investments	$	84,613	$	73,587	$	—	$	158,200