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Goodwill and Intangible Assets - Schedule of Finite-Life Intangible Assets, Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Jul. 31, 2017
Jan. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 (for the remaining six months) $ 854  
2019 862  
2020 305  
2021 7  
Finite-life intangible assets, Net $ 2,028 $ 2,603