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Equity Incentive Plans and Employee Stock Purchase Plan - Schedule of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Oct. 31, 2018
Jan. 31, 2018
Shares    
Balance - beginning of period (in shares) 12,637,435  
Stock options exercised (in shares) (2,540,312)  
Stock options forfeited and expired (in shares) (640,584)  
Balance - end of period (in shares) 9,456,539 12,637,435
Vested and exercisable (in shares) 5,377,483 5,540,858
Weighted- Average Exercise Price Per Share    
Balance - beginning of period (in dollars per share) $ 7.63  
Stock options exercised (in dollars per share) 6.92  
Stock options forfeited and expired (in dollars per share) 8.43  
Balance - end of period (in dollars per share) 7.76 $ 7.63
Vested and exercisable (in dollars per share) $ 6.89 $ 6.33
Weighted- Average Remaining Contractual Term (In Years)    
Balance 7 years 15 days 7 years 8 months 19 days
Vested and exercisable 6 years 3 months 15 days 6 years 7 months 17 days
Aggregate Intrinsic Value    
Balance $ 697,319 $ 246,227
Vested and exercisable $ 401,189 $ 115,122