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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue $ 608,960 $ 955,712
Costs and expenses    
Cost of revenue 412,039 542,419
Operations and support 88,931 133,782
Research and development 238,218 258,739
Sales and marketing 78,620 196,437
General and administrative 207,594 238,440
Total costs and expenses 1,025,402 1,369,817
Loss from operations (416,442) (414,105)
Interest expense (12,568) (1,507)
Other income, net 3,605 19,169
Loss before income taxes (425,405) (396,443)
Provision for income taxes 1,934 1,630
Net loss $ (427,339) $ (398,073)
Net loss per share, basic (in dollars per share) $ (1.31) $ (1.31)
Net loss per share, diluted (in dollars per share) $ (1.31) $ (1.31)
Weighted-average number of shares outstanding used to compute net loss per share, basic (in shares) 326,165 304,502
Weighted-average number of shares outstanding used to compute net loss per share, diluted (in shares) 326,165 304,502
Cost of revenue    
Stock-based compensation included in costs and expenses:    
Stock-based compensation expense $ 8,450 $ 9,724
Operations and support    
Stock-based compensation included in costs and expenses:    
Stock-based compensation expense 4,888 4,133
Research and development    
Stock-based compensation included in costs and expenses:    
Stock-based compensation expense 95,590 95,548
Sales and marketing    
Stock-based compensation included in costs and expenses:    
Stock-based compensation expense 7,963 4,750
General and administrative    
Stock-based compensation included in costs and expenses:    
Stock-based compensation expense $ 47,338 $ 45,823