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Revenue Recognition (Tables)
 6 Months Ended
Jul. 31, 2019
Revenue from Contract with Customer [Abstract]  
Summary Disaggregation of Revenue by Region
The following table summarizes revenue by region based on the billing address of customers:
Three Months Ended July 31, Six Months Ended July 31,
2019201820192018
AmountPercentage of
Revenue		AmountPercentage of
Revenue		AmountPercentage of
Revenue		AmountPercentage of
Revenue
(in thousands, except percentages)
Americas$117,098  80 %$61,155  82 %$215,258  80 %$110,715  82 %
Asia Pacific (APAC)12,088  8  6,078  8  22,529  9  10,820  8  
Europe, Middle East, and Africa (EMEA)16,640  12  7,293  10  30,027  11  13,061  10  
Total$145,826  100 %$74,526  100 %$267,814  100 %$134,596  100 %