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Composition of certain financial statement captions - Schedule Of Finite Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2020
Jan. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangibles $ 1,470 $ 1,470
Less accumulated amortization (331) (271)
Net carrying value $ 1,139 1,199
Acquired technology    
Finite-Lived Intangible Assets [Line Items]    
Useful life (years) 5 years  
Finite-lived intangibles $ 490 490
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Useful life (years) 7 years  
Finite-lived intangibles $ 980 $ 980