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Segments and Geographic Revenue - Schedule of total revenue by geographic areas (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total $ 64,985 $ 41,488 $ 170,697 $ 109,478
Americas        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total 42,889 28,045 112,477 74,965
Europe, Middle East and Africa        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total 18,553 11,418 49,168 30,340
Asia Pacific        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total $ 3,543 $ 2,025 $ 9,052 $ 4,173