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
Apr. 30, 2019
Apr. 30, 2018
Goodwill And Intangible Assets [Line Items]    
Amortization expense $ 298 $ 404
Cost of Revenue [Member]    
Goodwill And Intangible Assets [Line Items]    
Amortization expense   178
Selling and Marketing [Member]    
Goodwill And Intangible Assets [Line Items]    
Amortization expense 185 145
Research and Development [Member]    
Goodwill And Intangible Assets [Line Items]    
Amortization expense $ 113 $ 81