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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Revenue $ 320,426 $ 230,666
Costs and expenses:    
Cost of revenue 203,767 196,798
Research and development 216,185 200,986
Sales and marketing 97,882 102,113
General and administrative 118,653 123,299
Total costs and expenses 636,487 623,196
Operating loss (316,061) (392,530)
Interest income 7,816 6,104
Interest expense (756) (934)
Other income (expense), net (1,127) 3,153
Loss before income taxes (310,128) (384,207)
Income tax benefit (expense) (279) (1,578)
Net loss $ (310,407) $ (385,785)
Net loss per share attributable to Class A, Class B, and Class C common stockholders (Note 3):    
Basic $ (0.23) $ (0.30)
Diluted $ (0.23) $ (0.30)
Weighted average shares used in computation of net loss per share:    
Basic 1,340,615 1,270,998
Diluted 1,340,615 1,270,998