Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

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
	DECEMBER 31, 2016
(in thousands)	LEVEL 1		LEVEL 2		LEVEL 3		TOTAL
Cash and cash equivalents:
Cash and money market accounts	$	196,445	$	—	$	—	$	196,445
Commercial paper	—		1,500		—		1,500
Total cash and cash equivalents:	$	196,445	$	1,500	$	—	$	197,945
Investments:
Certificates of deposit	$	—	$	6,923	$	—	$	6,923
Corporate bonds	—		27,544		—		27,544
Government agencies	—		1,250		—		1,250
Total investments	$	—	$	35,717	$	—	$	35,717
Total cash, cash equivalents, and investments:	$	196,445	$	37,217	$	—	$	233,662

	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