Investments

6 Months Ended

Jun. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

Cash, cash equivalents and investments as of June 30, 2018 included the following:

(in thousands)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES			FAIR VALUE
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 (due within 1 year)	$	9,991	$	—	$	—		$	9,991
Corporate bonds (due within 1 year)	5,473		—		(9		)	5,464
Total investments	$	15,464	$	—	$	(9	)	$	15,455
Total cash, cash equivalents and investments	$	286,112	$	—	$	(9	)	$	286,103

Cash, cash equivalents and investments as of December 31, 2017 included the following:

(in thousands)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES			FAIR VALUE
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 (due within 1 year)	$	30,883	$	—	$	—		$	30,883
Corporate bonds (due within 1 year)	21,231		—		(28		)	21,203
Total investments	$	52,114	$	—	$	(28	)	$	52,086
Total cash, cash equivalents and investments	$	249,683	$	—	$	(28	)	$	249,655