Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Schedule of Amortization Expense of Intangible Assets in Cost of Revenue and Operating Expense (Detail)

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Goodwill and Intangible Assets - Schedule of Amortization Expense of Intangible Assets in Cost of Revenue and Operating Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Goodwill And Intangible Assets [Line Items]        
Amortization expense $ 300 $ 411 $ 598 $ 815
Cost of Revenue [Member]        
Goodwill And Intangible Assets [Line Items]        
Amortization expense   178   356
Selling and Marketing [Member]        
Goodwill And Intangible Assets [Line Items]        
Amortization expense 185 149 370 294
Research and Development [Member]        
Goodwill And Intangible Assets [Line Items]        
Amortization expense $ 115 $ 84 $ 228 $ 165