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Net Loss Per Share Attributable to Common Stockholders - Schedule of Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator:      
Net loss attributable to common stockholders $ (494.1) $ (270.2) $ (388.0)
Denominator:      
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 326,336,128 109,954,760 106,529,880
Net loss per share attributable to common stockholders, basic and diluted $ (1.51) $ (2.46) $ (3.64)