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
Oct. 31, 2017
Jan. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 (for the remaining three months) $ 478  
2019 873  
2020 260  
2021 5  
Finite-life intangible assets, Net $ 1,616 $ 2,603