v3.24.0.1
Income taxes - Narratives (Details) - USD ($)
 12 Months Ended
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2022
Operating Loss Carryforwards [Line Items]      
Provision for income taxes $ 1,543,000 $ 483,000 $ 182,000
Effective tax rate (as a percent) (1.10%) (0.30%) (0.20%)
Deferred tax assets, valuation allowance $ 176,641,000 $ 143,135,000  
Increase in valuation allowance 33,506,000    
Unrecognized tax benefits 1,240,000 0  
Tax examination, penalties and interest accrued $ 0    
Research Tax Credit Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforward, expiration period 20 years    
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforward $ 598,975,000 $ 493,333,000  
Foreign Tax Authority      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforward $ 0