Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

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 JUNE 30, 2018
(in thousands)	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash and money market funds	$	270,648	$	—	$	—	$	270,648
Total cash and cash equivalents	$	270,648	$	—	$	—	$	270,648
Investments:
Commercial paper	$	—	$	9,991	$	—	$	9,991
Corporate bonds	—		5,464		—		5,464
Total investments	$	—	$	15,455	$	—	$	15,455
Total cash, cash equivalents and investments	$	270,648	$	15,455	$	—	$	286,103

	FAIR VALUE MEASUREMENTS AS OF DECEMBER 31, 2017
(in thousands)	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash and money market funds	$	197,569	$	—	$	—	$	197,569
Total cash and cash equivalents	$	197,569	$	—	$	—	$	197,569
Investments:
Commercial paper	$	—	$	30,883	$	—	$	30,883
Corporate bonds	—		21,203		—		21,203
Total investments	$	—	$	52,086	$	—	$	52,086
Total cash, cash equivalents and investments	$	197,569	$	52,086	$	—	$	249,655