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Net Loss per Share - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2019
Jul. 31, 2019
Apr. 30, 2019
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Oct. 31, 2019
Oct. 31, 2018
Numerator:                
Net loss $ (40,896) [1] $ (36,234) $ (36,828) $ (40,196) [2] $ (38,085) $ (36,637) $ (113,958) [1] $ (114,918) [2]
Denominator:                
Weighted-average number of shares outstanding—basic and diluted 148,555 [1]     142,366 [2]     146,997 [1] 140,559 [2]
Net loss per share—basic and diluted $ (0.28) [1]     $ (0.28) [2]     $ (0.78) [1] $ (0.82) [2]
Class A Common Stock                
Numerator:                
Net loss $ (40,896)     $ (40,196)     $ (113,958) $ (110,868)
Denominator:                
Weighted-average number of shares outstanding—basic and diluted 148,555     142,366     146,997 135,605
Net loss per share—basic and diluted $ (0.28)     $ (0.28)     $ (0.78) $ (0.82)
Class B Common Stock                
Numerator:                
Net loss               $ (4,050)
Denominator:                
Weighted-average number of shares outstanding—basic and diluted               4,954
Net loss per share—basic and diluted               $ (0.82)
[1] As reported and disclosed under ASC Topic 842
[2] As reported and disclosed under ASC Topic 840