Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Income Statement [Abstract]
Revenue	$ 337,606	$ 331,856	$ 222,990
Cost of revenue	128,672	123,724	87,417
Gross profit	208,934	208,132	135,573
Operating expenses:
Research and development	204,946	167,337	140,759
Selling, general and administrative	78,244	70,438	55,980
Total operating expenses	283,190	237,775	196,739
Loss from operations	(74,256)	(29,643)	(61,166)
Other income, net	3,318	1,002	3,863
Loss before income taxes	(70,938)	(28,641)	(57,303)
Provision (benefit) for income taxes	(5,552)	(2,230)	2,483
Net loss	$ (65,386)	$ (26,411)	$ (59,786)
Net loss per share attributable to ordinary shareholders:
Basic	$ (1.70)	$ (0.72)	$ (1.72)
Diluted	$ (1.70)	$ (0.72)	$ (1.72)
Weighted-average shares used to compute net loss per share attributable to ordinary shareholders:
Basic	38,363,638	36,577,120	34,679,717
Diluted	38,363,638	36,577,120	34,679,717