Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue	$ 3,615,960	$ 2,156,616	$ 1,059,881
Costs and expenses
Cost of revenue	2,176,469	1,243,400	659,533
Operations and support	636,116	338,402	183,513
Research and development	1,505,640	300,836	136,646
Sales and marketing	814,122	803,751	567,015
General and administrative	1,186,093	447,938	221,446
Total costs and expenses	6,318,440	3,134,327	1,768,153
Loss from operations	(2,702,480)	(977,711)	(708,272)
Interest income	102,506	66,462	20,243
Other income, net	89	652	284
Loss before income taxes	(2,599,885)	(910,597)	(687,745)
Provision for income taxes	2,356	738	556
Net loss	$ (2,602,241)	$ (911,335)	$ (688,301)
Net loss per share, basic and diluted (in dollars per share)	$ (11.44)	$ (43.04)	$ (35.53)
Weighted-average number of shares outstanding used to compute net loss per share, basic and diluted (in shares)	227,498,000	21,176,000	19,371,000
Stock-based compensation included in costs and expenses:
Stock-based compensation expense	$ 1,599,311	$ 8,577	$ 9,546
Cost of revenue
Stock-based compensation included in costs and expenses:
Stock-based compensation expense	81,321	501	464
Operations and support
Stock-based compensation included in costs and expenses:
Stock-based compensation expense	75,212	177	2,549
Research and development
Stock-based compensation included in costs and expenses:
Stock-based compensation expense	971,941	4,107	2,379
Sales and marketing
Stock-based compensation included in costs and expenses:
Stock-based compensation expense	72,046	261	415
General and administrative
Stock-based compensation included in costs and expenses:
Stock-based compensation expense	$ 398,791	$ 3,531	$ 3,739