Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Revenue:
Total revenue	$ 106,477,000	$ 58,697,000	$ 53,835,000
Cost of revenue:
Total cost of revenue	42,462,000	20,419,000	7,729,000
Gross profit	64,015,000	38,278,000	46,106,000
Operating expenses:
Research and development	47,949,000	34,845,000	27,564,000
Selling, general and administrative	34,900,000	28,667,000	16,471,000
Impairment charges	3,134,000	0	0
Total operating expenses	85,983,000	63,512,000	44,035,000
Operating income (loss)	(21,968,000)	(25,234,000)	2,071,000
Other income (expense), net	(245,000)	(62,000)	24,000
Income (loss) before income taxes	(22,213,000)	(25,296,000)	2,095,000
Provision (benefit) for income taxes	(37,000)	2,215,000	766,000
Net income (loss)	(22,176,000)	(27,511,000)	1,329,000
Undistributed earnings attributable to participating securities	0	0	(1,329,000)
Net loss attributable to ordinary shareholders	$ (22,176,000)	$ (27,511,000)	$ 0
Net loss per share attributable to ordinary shareholders:
Net loss per share, basic (in US dollars per share)	$ (0.25)	$ (0.40)	$ 0
Net loss per share, diluted (in US dollars per share)	$ (0.25)	$ (0.40)	$ 0
Weighted-average shares used in computing net loss per share attributable to ordinary shareholders:
Weighted-average shares used in computing net loss per share, basic (in shares)	88,398	69,099	71,728
Weighted-average shares used in computing net loss per share, diluted (in shares)	88,398	69,099	71,728
Product sales
Revenue:
Total revenue	$ 73,721,000	$ 27,477,000	$ 11,617,000
Cost of revenue:
Total cost of revenue	40,082,000	16,071,000	6,713,000
Product engineering services
Revenue:
Total revenue	7,741,000	9,579,000	5,311,000
Cost of revenue:
Total cost of revenue	1,918,000	3,168,000	757,000
IP license
Revenue:
Total revenue	23,309,000	17,273,000	33,671,000
IP license engineering services
Revenue:
Total revenue	1,706,000	4,368,000	3,236,000
Cost of revenue:
Total cost of revenue	$ 462,000	$ 1,180,000	$ 259,000