Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Valuation Assumptions Used (Details)

v3.20.2
Stockholders' Equity - Summary of Valuation Assumptions Used (Details) - Stock Incentive Plan and Stock Option Grants to Employees and Directors
12 Months Ended
Apr. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected life (years) 3 years 6 months
Expected volatility 57.00%
Risk-free interest rate 0.24%
Dividend yield 0.00%