Income Taxes (Details - Deferred income taxes) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022
Income Tax Disclosure [Abstract]
Net operating losses	$ 112,194	$ 99,710
Research and development credits	5,569	5,550
Stock-based compensation	2,589	2,710
Deferred revenue	2,420	5,494
Lease liabilities	12,742	11,107
Accrued liabilities	2,248	785
Accrued compensation	1,781	1,705
Total deferred tax assets	139,543	127,061
Less valuation allowance	0	0
Total deferred tax assets, net of valuation allowance	139,543	127,061
Deferred tax liabilities:
Fixed assets	(14,320)	(1,972)
ROU assets	(11,584)	(10,007)
Total deferred tax liabilities	(25,904)	(11,979)
Net deferred tax assets	$ 113,639	$ 115,082