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Segment Reporting - Summary of Significant Segment Expense Included in Consolidated Net Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2025
Apr. 30, 2025
Jul. 31, 2024
Apr. 30, 2024
Jul. 31, 2025
Jul. 31, 2024
Revenue from External Customer [Line Items]            
Total revenue $ 95,511   $ 63,724   $ 181,383 $ 118,197
Less cost and expense:            
Product cost 39,280   24,983   73,616 46,296
Employee-related 32,066   29,079   63,525 57,462
Stock-based compensation 25,188   27,612   51,318 53,648
Semiconductor development cost 7,829   6,230   14,601 12,604
Tools & equipment 7,361   6,596   15,427 11,969
Professional services 3,804   3,768   7,491 8,142
Facilities-related 2,886   2,697   5,548 5,464
Other segment items 823   1,334   1,779 2,803
Interest income (2,194)   (2,096)   (4,354) (4,416)
Net loss (19,995) $ (24,328) (34,889) $ (37,932) (44,323) (72,821)
Product [Member]            
Less cost and expense:            
Product cost $ 37,743   $ 23,393   $ 70,371 $ 43,342