Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Income Statement [Abstract]
Revenue	$ 70,133	$ 54,645
Cost of revenue	26,368	22,625
Gross profit	43,765	32,020
Operating expenses:
Research and development	37,874	34,200
Selling, general and administrative	16,027	13,435
Total operating expenses	53,901	47,635
Loss from operations	(10,136)	(15,615)
Other income, net	593	1,278
Loss before income taxes	(9,543)	(14,337)
Provision for income taxes	1,275	1,126
Net loss	$ (10,818)	$ (15,463)
Net loss per share attributable to ordinary shareholders:
Basic	$ (0.30)	$ (0.45)
Diluted	$ (0.30)	$ (0.45)
Weighted-average shares used to compute net loss per share attributable to ordinary shareholders:
Basic	35,940,304	34,080,330
Diluted	35,940,304	34,080,330