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Net Loss per Share Attributable to Common Stockholders - Calculation of basic and diluted net loss per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Numerator:    
Net loss $ (45,722) $ (270,687)
Less: preferred stock accretion 0 (353)
Net loss attributable to common stockholders $ (45,722) $ (271,040)
Denominator:    
Weighted-average common shares outstanding (in shares) 172,101 36,334
Net loss per share attributable to common stockholders:    
Basic and diluted (in usd per share) $ (0.27) $ (7.46)