Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 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 SEPTEMBER 30, 2016
(in thousands)	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash and money market accounts	$	206,708	$	—	$	—	$	206,708
Certificates of deposit	—		480		—		480
Commercial paper	—		1,499		—		1,499
Corporate bonds	—		1,251		—		1,251
Government agencies	—		2,000		—		2,000
Total cash and cash equivalents	$	206,708	$	5,230	$	—	$	211,938
Investments:
Certificates of deposit	$	—	$	10,290	$	—	$	10,290
Commercial paper	—		1,500		—		1,500
Corporate bonds	—		27,362		—		27,362
Government agencies	—		4,512		—		4,512
Total investments	$	—	$	43,664	$	—	$	43,664
Total cash, cash equivalents, and investments	$	206,708	$	48,894	$	—	$	255,602

	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