Condensed Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 408,363,000	$ 218,805,000	$ 1,025,052,000	$ 580,718,000
Operating expenses
Cost of sales (exclusive of amortization of acquired intangible assets)	95,061,000	52,335,000	254,559,000	146,301,000
Research and development	31,471,000	34,714,000	107,653,000	96,471,000
Sales and marketing	136,481,000	86,196,000	423,092,000	265,325,000
General and administrative	115,589,000	80,538,000	336,265,000	208,067,000
Amortization of acquired intangible assets	23,430,000	748,000	70,199,000	2,256,000
Intangible asset impairment charge	209,666,000	0	209,666,000	0
Total operating expenses	611,698,000	254,531,000	1,401,434,000	718,420,000
Other operating income	0	0	23,665,000	0
Loss from operations	(203,335,000)	(35,726,000)	(352,717,000)	(137,702,000)
Other income (expense)
Investment income, net	2,523,000	9,093,000	5,532,000	23,417,000
Interest expense	(23,582,000)	(13,209,000)	(71,647,000)	(47,911,000)
Total other income (expense)	(21,059,000)	(4,116,000)	(66,115,000)	(24,494,000)
Net loss before tax	(224,394,000)	(39,842,000)	(418,832,000)	(162,196,000)
Income tax benefit (expense)	4,510,000	(683,000)	7,109,000	230,000
Net loss	$ (219,884,000)	$ (40,525,000)	$ (411,723,000)	$ (161,966,000)
Net loss per share - basic and diluted (in usd per share)	$ (1.46)	$ (0.31)	$ (2.76)	$ (1.26)
Weighted average common shares outstanding - basic and diluted (in shares)	150,155	129,567	149,346	128,344