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Segment Reporting - Summary of Significant Segment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Apr. 30, 2026
Jan. 31, 2026
Apr. 30, 2025
Jan. 31, 2025
Apr. 30, 2026
Apr. 30, 2025
Research and development expenses:            
Total research and development expenses $ 22,195   $ 20,209   $ 44,450 $ 40,183
General and administrative expenses:            
Other general and administrative expenses 4,091   2,493   7,879 5,521
Total general and administrative expenses 9,773   6,915   18,703 13,554
Other segment items (1,741)   (1,309)   (3,174) (3,306)
Net loss 30,227 $ 29,752 25,815 $ 24,616 59,979 50,431
Chemistry, Manufacturing and Controls            
Research and development expenses:            
Total research and development expenses 7,682   7,817   18,154 19,379
Clinical Operations            
Research and development expenses:            
Total research and development expenses 5,106   4,549   9,165 8,114
Other Research and Development Expenses            
Research and development expenses:            
Total research and development expenses 2,070   2,605   3,400 3,653
Personnel-Related Expenses Excluding Stock-Based Compensation            
Research and development expenses:            
Total research and development expenses 5,710   4,350   11,100 7,524
General and administrative expenses:            
Total general and administrative expenses 3,164   2,660   6,507 5,087
Stock Based Compensation            
Research and development expenses:            
Total research and development expenses 1,627   888   2,631 1,513
General and administrative expenses:            
Total general and administrative expenses $ 2,518   $ 1,762   $ 4,317 $ 2,946