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7. Discontinued Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]        
Gain on sale of research and development assets before income taxes     $ 0 $ 1,000 [1]
Income tax expense       (261)
Income from discontinued operations, net of tax $ 0 $ 0 $ 0 $ 739
[1] The gain on sale of research and development assets before income taxes was recorded in connection with the $1.0 million we received from Oncologie, Inc. ("Oncologie") under the September 2018 Asset Assignment and Purchase Agreement pursuant to which we sold to Oncologie our r84 technology, which included the assignment of certain licenses, patents and other assets useful and/or necessary for the potential commercialization of the r84 technology.