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Significant Customers	12 Months Ended
Significant Customers	Apr. 30, 2020
Risks and Uncertainties [Abstract]
Significant Customers	Significant Customers For the year ended April 30, 2020, none of our customers accounted for more than 10.0% of our total revenue. For the year ended April 30, 2019, one of our customers accounted for more than 10.0% of our total revenue in the amount of $2.9 million, or 10.7% . The revenue from this customer is part of the TOS business and was captured in the consolidated oncology services revenue line item within the statement of operations. As of April 30, 2020 and 2019, none of our customers accounted for more than 10.0% of our total accounts receivable balance.