Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Revenue:
Total revenue	$ 31,800	$ 13,458	$ 68,951	$ 38,947
Cost of revenue:
Cost of revenue	12,688	5,387	28,705	14,033
Gross profit	19,112	8,071	40,246	24,914
Operating expenses:
Research and development	10,995	6,993	32,488	26,636
Selling, general and administrative	8,568	5,872	23,393	21,602
Total operating expenses	19,563	12,865	55,881	48,238
Operating loss	(451)	(4,794)	(15,635)	(23,324)
Other income (expense), net	(80)	49	(70)	(40)
Loss before income taxes	(531)	(4,745)	(15,705)	(23,364)
Provision (benefit) for income taxes	(387)	372	1,116	1,061
Net loss	$ (144)	$ (5,117)	$ (16,821)	$ (24,425)
Net loss per share:
Net loss per share, basic (in US dollars per share)	$ 0	$ (0.08)	$ (0.24)	$ (0.35)
Net loss per share, diluted (in US dollars per share)	$ 0	$ (0.08)	$ (0.24)	$ (0.35)
Weighted-average shares used in computing net loss per share:
Weighted-average shares used in computing net loss per share, basic (in shares)	73,815	67,429	70,439	69,418
Weighted-average shares used in computing net loss per share, diluted (in shares)	73,815	67,429	70,439	69,418
Product sales
Revenue:
Total revenue	$ 22,706	$ 6,178	$ 48,423	$ 18,730
Cost of revenue:
Cost of revenue	12,230	4,094	26,436	10,936
Product engineering services
Revenue:
Total revenue	3,954	3,010	6,628	5,349
Cost of revenue:
Cost of revenue	410	1,023	1,807	2,294
IP license
Revenue:
Total revenue	5,022	3,154	12,194	11,551
IP license engineering services
Revenue:
Total revenue	118	1,116	1,706	3,317
Cost of revenue:
Cost of revenue	$ 48	$ 270	$ 462	$ 803