Annual report pursuant to Section 13 and 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
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Goodwill And Intangible Assets [Line Items]    
Amortization expense $ 896 $ 1,559
Cost of Product Revenue [Member]    
Goodwill And Intangible Assets [Line Items]    
Amortization expense 28 106
Selling and Marketing [Member]    
Goodwill And Intangible Assets [Line Items]    
Amortization expense 687 1,273
Research and Development [Member]    
Goodwill And Intangible Assets [Line Items]    
Amortization expense $ 181 $ 180