Annual report pursuant to Section 13 and 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
Jan. 31, 2018
Jan. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 $ 914  
2020 385  
2021 4  
Finite-lived intangible assets, Net $ 1,303 $ 2,603