Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 268,868	$ 199,870	$ 616,689	$ 361,913
Operating expenses
Cost of sales (exclusive of amortization of acquired intangible assets)	77,892	51,139	159,498	93,966
Research and development	32,673	29,972	76,182	61,757
Sales and marketing	118,862	88,190	286,611	179,129
General and administrative	106,685	63,723	220,676	127,529
Amortization of acquired intangible assets	23,430	748	46,769	1,508
Total operating expenses	359,542	233,772	789,736	463,889
Other operating income	23,665	0	23,665	0
Loss from operations	(67,009)	(33,902)	(149,382)	(101,976)
Other income (expense)
Investment income, net	2,912	7,669	3,009	14,324
Interest expense	(22,912)	(12,712)	(48,065)	(34,702)
Total other income (expense)	(20,000)	(5,043)	(45,056)	(20,378)
Net loss before tax	(87,009)	(38,945)	(194,438)	(122,354)
Income tax benefit	867	443	2,599	913
Net loss	$ (86,142)	$ (38,502)	$ (191,839)	$ (121,441)
Net loss per share - basic and diluted (in usd per share)	$ (0.58)	$ (0.30)	$ (1.29)	$ (0.95)
Weighted average common shares outstanding - basic and diluted (in shares)	149,727	129,182	148,938	127,723