Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

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 MARCH 31, 2016
(in thousands)	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash and money market accounts	$	74,266	$	—	$	—	$	74,266
Total cash and cash equivalents	$	74,266	$	—	$	—	$	74,266
Investments:
Certificates of deposit	$	—	$	14,888	$	—	$	14,888
Commercial paper	—		5,983		—		5,983
Corporate bonds	—		31,100		—		31,100
Government agencies	—		4,532		—		4,532
Total investments	$	—	$	56,503	$	—	$	56,503
Total cash, cash equivalents, and investments	$	74,266	$	56,503	$	—	$	130,769

	FAIR VALUE MEASUREMENTS AS OF DECEMBER 31, 2015
(in thousands)	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash and money market accounts	$	91,060	$	—	$	—	$	91,060
Total cash and cash equivalents	$	91,060	$	—	$	—	$	91,060
Investments:
Certificates of deposit	$	—	$	18,355	$	—	$	18,355
Commercial paper	—		5,966		—		5,966
Corporate bonds	—		32,995		—		32,995
Government agencies	—		1,994		—		1,994
Total investments	$	—	$	59,310	$	—	$	59,310
Total cash, cash equivalents, and investments	$	91,060	$	59,310	$	—	$	150,370