Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2017

Cash and Cash Equivalents [Abstract]

Summary of cash, cash equivalents and marketable securities

A summary of the Company’s cash, cash equivalents and marketable securities is shown below:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
As of March 31, 2017
Cash and cash equivalents:
Cash and money market funds	$	985,818	$	—	$	—		$	985,818
Commercial paper	6,834		—		—			6,834
Corporate debt securities	11,027		—		—			11,027
Total cash and cash equivalents	$	1,003,679	$	—	$	—		$	1,003,679
Marketable securities:
Corporate equity securities	43,213		26,159		—			69,372
Commercial paper (matures within 1 year)	132,640		1		(91		)	132,550
Corporate debt securities (matures within 1 year)	180,465		3		(143		)	180,325
Corporate debt securities (matures after 1 year)	$	22,882	$	—	$	(26	)	$	22,856
Total marketable securities	$	379,200	$	26,163	$	(260	)	$	405,103
Total cash, cash equivalents and marketable securities	$	1,382,879	$	26,163	$	(260	)	$	1,408,782
As of December 31, 2016
Cash and cash equivalents:
Cash and money market funds	$	1,183,945	$	—	$	—		$	1,183,945
Total cash and cash equivalents	$	1,183,945	$	—	$	—		$	1,183,945
Marketable securities:
Government-sponsored enterprise securities (matures within 1 year)	$	15,506	$	2	$	—		$	15,508
Corporate equity securities	43,213		21,347		—			64,560
Commercial paper (matures within 1 year)	59,331		73		—			59,404
Corporate debt securities (matures within 1 year)	111,225		—		(85		)	111,140
Total marketable securities	$	229,275	$	21,422	$	(85	)	$	250,612
Total cash, cash equivalents and marketable securities	$	1,413,220	$	21,422	$	(85	)	$	1,434,557