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Intangible Assets - Summary of Estimated Future Amortization Expense of Software Licenses (Detail) - USD ($)
$ in Thousands
Jul. 31, 2019
Jan. 31, 2019
Finite Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 9,008 $ 10,936
Internal-use software licenses [Member]    
Finite Lived Intangible Assets [Line Items]    
2020 (6 months remaining) 2,629  
2021 1,911  
2022 368  
2023 0  
2024 0  
Thereafter 0  
Net Carrying Amount $ 4,908 $ 6,836