Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Schedule of Financial Assets Subject to Fair Value Measurements (Excluding Vie Cash and Cash Equivalents, Which are Recorded as Restricted Cash and Cash Equivalents (Vie))

The following tables set forth the Company’s financial assets and liabilities subject to fair value measurements by level within the fair value hierarchy (and does not include $2.3 billion and $2.3 billion of cash as of June 30, 2020 and December 31, 2019, respectively):

	As of June 30, 2020								As of December 31, 2019
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
	(in thousands)
Financial instruments carried at fair value (asset positions):
Cash equivalents:
Money market funds	$	2,476,713	$	2,476,713	$	—	$	—	$	791,039	$	791,039	$	—	$	—
Corporate debt securities	4,835		—		4,835		—		6,070		—		6,070		—
Commercial paper	93,107		—		93,107		—		29,472		—		29,472		—
Marketable securities:
Corporate equity securities	219,327		209,214		10,113		—		282,084		261,797		20,287		—
Government-sponsored enterprise securities	11,253		11,253		—		—		12,733		12,733		—		—
Corporate debt securities	293,976		—		293,976		—		301,799		—		301,799		—
Commercial paper	94,881		—		94,881		—		102,356		—		102,356		—
Prepaid expenses and other current assets:
Foreign currency forward contracts	8,054		—		8,054		—		9,725		—		9,725		—
Other assets:
Foreign currency forward contracts	44		—		44		—		—		—		—		—
Total financial assets	$	3,202,190	$	2,697,180	$	505,010	$	—	$	1,535,278	$	1,065,569	$	469,709	$	—
Financial instruments carried at fair value (liability positions):
Other current liabilities:
Foreign currency forward contracts	$	(4,871)	$	—	$	(4,871)	$	—	$	(5,533)	$	—	$	(5,533)	$	—
Long-term contingent consideration	(187,300)		—		—		(187,300)		(176,500)		—		—		(176,500)
Other long-term liabilities:
Foreign currency forward contracts	(1,462)		—		(1,462)		—		(1,821)		—		(1,821)		—
Total financial liabilities	$	(193,633)	$	—	$	(6,333)	$	(187,300)	$	(183,854)	$	—	$	(7,354)	$	(176,500)

Schedule of Fair Value of Our Contingent Consideration Liabilities

The following table represents a rollforward of the fair value of the Company’s contingent consideration liabilities:

	Six Months Ended June 30, 2020
	(in thousands)
Balance at December 31, 2019	$	176,500
Increase in fair value of contingent payments	10,800
Balance at June 30, 2020	$	187,300