Investments

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

Cash, cash equivalents and investments as of March 31, 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	$	237,514	$	—	$	—		$	237,514
Commercial paper	11,987		—		—			11,987
Total cash and cash equivalents	$	249,501	$	—	$	—		$	249,501
Investments:
Commercial paper (due within 1 year)	$	44,209	$	—	$	—		$	44,209
Corporate bonds (due within 1 year)	40,424		—		(157		)	40,267
Total investments	$	84,633	$	—	$	(157	)	$	84,476
Total cash, cash equivalents and investments	$	334,134	$	—	$	(157	)	$	333,977

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