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Leases - Components of operating lease expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Jul. 31, 2023
Jul. 31, 2022
Jan. 31, 2023
Leases          
Operating lease cost $ 1,027 $ 1,078 $ 2,000 $ 2,143  
Short-term lease cost 146 150 328 299  
Total operating lease cost 1,173 1,228 2,328 2,442  
Operating cash outflows from operating leases included in measurement of lease liabilities 1,104 1,148 2,093 2,264  
New ROU assets obtained in exchange for lease obligations $ 348 $ 122 $ 830 $ 346  
Weighted average remaining lease term (years) 2 years 3 months 18 days   2 years 3 months 18 days   2 years 7 months 6 days
Weighted average discount rate (%) 2.70%   2.70%   2.40%