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Segment Reporting - Summary of Significant Segment Expense Included in Consolidated Net Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2025
Jul. 31, 2025
Apr. 30, 2025
Oct. 31, 2024
Jul. 31, 2024
Apr. 30, 2024
Oct. 31, 2025
Oct. 31, 2024
Revenue from External Customer [Line Items]                
Total revenue $ 108,452     $ 82,653     $ 289,835 $ 200,850
Less cost and expense:                
Product cost 43,866     32,605     117,482 78,901
Employee-related 32,828     28,820     96,353 86,282
Stock-based compensation 25,741     26,847     77,059 80,495
Semiconductor development cost 9,227     8,684     23,828 21,288
Tools & equipment 6,422     6,217     21,849 18,186
Professional services 3,924     3,582     11,415 11,724
Facilities-related 3,342     2,708     8,890 8,172
Other segment items 1,813     1,065     3,592 3,868
Interest income (2,190)     (2,148)     (6,544) (6,564)
Net loss (15,107) $ (19,995) $ (24,328) (24,071) $ (34,889) $ (37,932) (59,430) (96,892)
Product [Member]                
Less cost and expense:                
Product cost $ 42,452     $ 30,949     $ 112,823 $ 74,291