Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Schedule of Finite-Life Intangible Assets, Amortization Expense (Detail)

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Goodwill and Intangible Assets - Schedule of Finite-Life Intangible Assets, Amortization Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Goodwill And Intangible Assets [Line Items]        
Amortization expense $ 299 $ 300 $ 583 $ 598
Selling and Marketing [Member]        
Goodwill And Intangible Assets [Line Items]        
Amortization expense 366 185 366 370
Research and Development [Member]        
Goodwill And Intangible Assets [Line Items]        
Amortization expense $ (67) $ 115 $ 217 $ 228