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Stock warrants - Activity for the Company's warrants (Detail) - shares
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Common      
Stock Warrants [Roll Forward]      
Beginning balance (in shares) 256,411 256,411 256,411
Forfeited (in shares)   0  
Granted (in shares) 150,274    
Conversion of preferred stock warrants to common stock warrants (in shares) 581,798    
Exercised (in shares) (913,346)   0
Ending balance (in shares) 75,137 256,411 256,411
Preferred      
Stock Warrants [Roll Forward]      
Beginning balance (in shares) 1,636,641 1,773,076 1,813,076
Forfeited (in shares)   (136,435)  
Granted (in shares) 0    
Conversion of preferred stock warrants to common stock warrants (in shares) 0    
Exercised (in shares) (1,636,641)   (40,000)
Ending balance (in shares) 0 1,636,641 1,773,076