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Geographic Information (Tables)
12 Months Ended
Jan. 31, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of Revenue by Geographic Area
Revenue by geographic area is determined by the billing address of the customer. The following table sets forth revenue by geographic area (in thousands): 
 
Year Ended January 31,
 
2017
 
2018
 
2019
United States
$
64,144

 
$
88,748

 
$
110,181

Outside the United States
10,396

 
19,776

 
32,283

Total
$
74,540

 
$
108,524

 
$
142,464

Percentage of revenue by geographic area:
 
 
 
 
 
United States
86
%
 
82
%
 
77
%
Outside the United States
14
%
 
18
%
 
23
%