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Common Stock and Stockholders' Equity (Deficit) - Summary of Stock Option Activity (Details) - 2006 Stock Plan and 2016 Plan - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock Options, Outstanding, Beginning Balance 9,543,966  
Stock Options, grants 5,573,721  
Stock Options, exercised (1,184,708)  
Stock Options, forfeited (916,577)  
Stock Options, Outstanding, Ending Balance 13,016,402 9,543,966
Stock Options, Vested and expected to vest 12,043,481  
Stock Options, Exercisable 6,859,340  
Weighted-Average Exercise Price, Options Outstanding, Beginning Balance $ 2.84  
Weighted-Average Exercise Price, Option grants 9.75  
Weighted-Average Exercise Price, Options exercised 3.59  
Weighted-Average Exercise Price, Options forfeited 4.72  
Weighted-Average Exercise Price, Options Outstanding, Ending Balance 5.60 $ 2.84
Weighted-Average Exercise Price, Vested and expected to vest 5.34  
Weighted-Average Exercise Price, Exercisable $ 3.63  
Weighted-Average Remaining Contractual Life (n years), Options Outstanding 7 years 11 months 1 day 8 years 29 days
Weighted-Average Remaining Contractual Life (in years), Vested and expected to vest 7 years 10 months 2 days  
Weighted-Average Remaining Contractual Life (in years), Exercisable 7 years 2 months 5 days  
Aggregate Intrinsic Value, Options Outstanding $ 265,542 $ 47,658
Aggregate Intrinsic Value, Vested and expected to vest 248,821  
Aggregate Intrinsic Value, Exercisable $ 153,406