Geographic Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue $ 56,194 $ 36,319
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue 44,155 27,139
EMEA    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue 6,249 4,483
Asia Pacific    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue 2,825 2,818
Americas other than the United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue $ 2,965 $ 1,879