7. Income Taxers (Details - Deferred income taxes) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Income Tax Disclosure [Abstract]
Net operating losses	$ 109,663	$ 114,105
Research and development credits	7,566	0
Share-based compensation	2,776	2,573
Deferred revenue	1,086	810
Lease liabilities	6,260	6,324
Debt issuance costs	470	0
Accrued liabilities and other	942	1,197
Accrued compensation	2,263	0
Total deferred tax assets	131,026	125,009
Less valuation allowance	(111,388)	(118,137)
Net deferred tax assets	19,638	6,872
Deferred tax liabilities:
Fixed assets	(1,404)	(1,216)
ROU assets	(5,508)	(5,656)
Beneficial conversion feature	(12,726)	0
Total deferred tax liabilities	(19,638)	(6,872)
Net deferred tax assets	$ 0	$ 0