10. Sale of Research and Development Assets (Details - Balance Sheet) - USD ($) $ in Thousands	Apr. 30, 2019	Apr. 30, 2018
Assets:
Total assets of discontinued operations	$ 0	$ 5,000
Liabilities:
Accrued payroll and related costs	$ 3,540	2,564
Discontinued Operations [Member] [Default Label]
Assets:
Other receivables		5,000
Total assets of discontinued operations		5,000
Liabilities:
Accounts payable		32
Accrued clinical trial and related fees		3,613
Accrued payroll and related costs		614
Other liabilities		291
Total liabilities of discontinued operations		$ 4,550