Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 867,265	$ 504,912	$ 1,643,292	$ 902,100
Costs and expenses
Cost of revenue	630,136	293,186	1,092,993	553,795
Operations and support	151,975	67,366	339,210	127,271
Research and development	309,833	64,415	940,793	127,607
Sales and marketing	180,951	175,107	456,080	343,814
General and administrative	267,286	98,472	644,022	188,626
Total costs and expenses	1,540,181	698,546	3,473,098	1,341,113
Loss from operations	(672,916)	(193,634)	(1,829,806)	(439,013)
Interest income	29,979	15,251	49,633	26,752
Other expense, net	(311)	(289)	(165)	(344)
Loss before income taxes	(643,248)	(178,672)	(1,780,338)	(412,605)
Provision for income taxes	991	231	2,374	637
Net loss	$ (644,239)	$ (178,903)	$ (1,782,712)	$ (413,242)
Net loss per share, basic and diluted	$ (2.23)	$ (8.48)	$ (11.38)	$ (20.09)
Weighted-average number of shares outstanding used to compute net loss per share, basic and diluted	288,372	21,088	156,647	20,566
Cost of revenue
Costs and expenses
Stock-based compensation expense	$ 15,058	$ 137	$ 56,548	$ 242
Operations and support
Costs and expenses
Stock-based compensation expense	8,221	46	59,624	97
Research and development
Costs and expenses
Stock-based compensation expense	182,918	515	689,124	1,243
Sales and marketing
Costs and expenses
Stock-based compensation expense	12,133	47	57,244	174
General and administrative
Costs and expenses
Stock-based compensation expense	$ 74,908	$ 756	$ 290,184	$ 1,741