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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
Apr. 30, 2018
Apr. 30, 2017
Numerator:    
Net loss $ (36,637) $ (40,086)
Denominator:    
Weighted-average number of shares outstanding— basic and diluted 138,524 131,469
Net loss per share—basic and diluted $ (0.26) $ (0.30)
Class A Common Stock    
Numerator:    
Net loss $ (33,706) $ (22,061)
Denominator:    
Weighted-average number of shares outstanding— basic and diluted 127,444 72,352
Net loss per share—basic and diluted $ (0.26) $ (0.30)
Class B Common Stock    
Numerator:    
Net loss $ (2,931) $ (18,025)
Denominator:    
Weighted-average number of shares outstanding— basic and diluted 11,080 59,117
Net loss per share—basic and diluted $ (0.26) $ (0.30)