Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Income Statement [Abstract]
Revenue	$ 390,702	$ 284,865	$ 226,474
Cost of revenue	159,436	112,535	89,657
Gross profit	231,266	172,330	136,817
Operating expenses:
Research and development	238,519	226,109	215,052
Selling, general and administrative	75,274	72,816	76,325
Total operating expenses	313,793	298,925	291,377
Loss from operations	(82,527)	(126,595)	(154,560)
Other income, net	8,830	8,867	6,030
Loss before income taxes	(73,697)	(117,728)	(148,530)
Provision (benefit) for income taxes	2,168	(602)	20,887
Net loss	$ (75,865)	$ (117,126)	$ (169,417)
Net loss per share attributable to ordinary shareholders:
Basic	$ (1.78)	$ (2.84)	$ (4.25)
Diluted	$ (1.78)	$ (2.84)	$ (4.25)
Weighted-average shares used to compute net loss per share attributable to ordinary shareholders:
Basic	42,704,312	41,303,287	39,878,872
Diluted	42,704,312	41,303,287	39,878,872