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Leases - Components of operating lease expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2024
Jul. 31, 2023
Jul. 31, 2024
Jul. 31, 2023
Jan. 31, 2023
Leases          
Operating lease cost $ 927 $ 1,027 $ 1,835 $ 2,000  
Short-term lease cost 116 146 236 328  
Total operating lease cost 1,043 1,173 2,071 2,328  
Operating cash outflows from operating leases included in measurement of lease liabilities 1,113 1,104 2,067 2,093  
New ROU assets obtained in exchange for lease obligations $ 571 $ 348 $ 1,524 $ 830  
Weighted average remaining lease term (years) 3 years   3 years   3 years
Weighted average discount rate (%) 4.80%   4.80%   4.10%