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Net Loss per Share Attributable to Common Stockholders - Schedule of Computation of Basic and Diluted Earnings per Share Attributable to Common Stockholders (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net loss attributable to common stockholders $ (39,963) $ (32,746)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares) 305,947 296,077
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) $ (0.13) $ (0.11)
Class A common stock | Common stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net loss attributable to common stockholders $ (32,889) $ (10,876)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares) 251,793 98,337
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) $ (0.13) $ (0.11)
Class B common stock | Common stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net loss attributable to common stockholders $ (7,074) $ (21,870)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares) 54,154 197,740
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) $ (0.13) $ (0.11)