Quarterly report pursuant to Section 13 or 15(d)

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

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Goodwill and Intangible Assets - Schedule of Finite-Life Intangible Assets, Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Jul. 31, 2018
Jan. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 (for the remaining six months) $ 440  
2020 326  
2021 8  
2022 4  
2023 4  
2024 and thereafter 42  
Finite-life intangible assets, Net $ 824 $ 1,303