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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Jul. 31, 2023
Jul. 31, 2022
Income Statement [Abstract]        
Revenue $ 62,121 $ 80,884 $ 124,263 $ 171,189
Cost of revenue 23,659 29,820 48,282 63,578
Gross profit 38,462 51,064 75,981 107,611
Operating expenses:        
Research and development 54,917 52,338 109,358 99,028
Selling, general and administrative 18,884 18,914 37,504 39,269
Total operating expenses 73,801 71,252 146,862 138,297
Loss from operations (35,339) (20,188) (70,881) (30,686)
Other income (expense), net 737 (26) 2,023 60
Loss before income taxes (34,602) (20,214) (68,858) (30,626)
Provision (benefit) for income taxes (3,404) 3,436 (1,758) 3,846
Net loss $ (31,198) $ (23,650) $ (67,100) $ (34,472)
Net income loss per share attributable to ordinary shareholders:        
Basic $ (0.79) $ (0.62) $ (1.7) $ (0.91)
Diluted $ (0.79) $ (0.62) $ (1.7) $ (0.91)
Weighted-average shares used to compute net loss per share attributable to ordinary shareholders:        
Basic 39,736,704 38,258,341 39,538,748 37,986,839
Diluted 39,736,704 38,258,341 39,538,748 37,986,839