Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Income Statement [Abstract]
Revenue	$ 92,167	$ 56,090	$ 241,627	$ 160,848
Cost of revenue	34,541	21,298	90,817	63,078
Gross profit	57,626	34,792	150,810	97,770
Operating expenses:
Research and development	41,362	36,573	118,794	103,575
Selling, general and administrative	17,475	14,468	49,323	41,348
Total operating expenses	58,837	51,041	168,117	144,923
Loss from operations	(1,211)	(16,249)	(17,307)	(47,153)
Other income, net	407	673	1,218	3,231
Loss before income taxes	(804)	(15,576)	(16,089)	(43,922)
Provision (benefit) for income taxes	(1,560)	1,502	1,129	3,375
Net income (loss)	$ 756	$ (17,078)	$ (17,218)	$ (47,297)
Net income (loss) per share attributable to ordinary shareholders:
Basic	$ 0.02	$ (0.49)	$ (0.47)	$ (1.37)
Diluted	$ 0.02	$ (0.49)	$ (0.47)	$ (1.37)
Weighted-average shares used to compute net income (loss) per share attributable to ordinary shareholders:
Basic	36,792,187	34,819,880	36,391,676	34,460,172
Diluted	39,046,274	34,819,880	36,391,676	34,460,172