Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Income Statement [Abstract]
Revenue	$ 331,856	$ 222,990	$ 228,732
Cost of revenue	123,724	87,417	96,023
Gross profit	208,132	135,573	132,709
Operating expenses:
Research and development	167,337	140,759	129,724
Selling, general and administrative	70,438	55,980	52,634
Total operating expenses	237,775	196,739	182,358
Loss from operations	(29,643)	(61,166)	(49,649)
Other income, net	1,002	3,863	8,021
Loss before income taxes	(28,641)	(57,303)	(41,628)
Provision (benefit) for income taxes	(2,230)	2,483	3,164
Net loss	$ (26,411)	$ (59,786)	$ (44,792)
Net loss per share attributable to ordinary shareholders:
Basic	$ (0.72)	$ (1.72)	$ (1.35)
Diluted	$ (0.72)	$ (1.72)	$ (1.35)
Weighted-average shares used to compute net loss per share attributable to ordinary shareholders:
Basic	36,577,120	34,679,717	33,083,562
Diluted	36,577,120	34,679,717	33,083,562