Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3.a.u2
Stockholders' Equity - Summary of Valuation Assumptions Used (Details)
6 Months Ended 12 Months Ended
Oct. 31, 2019
Apr. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected life (years)   3 years 6 months
Stock Incentive Plan and Stock Option Grants to Employees and Directors    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected life (years) 3 years 6 months  
Expected volatility 46.00% 50.10%
Risk-free interest rate 1.67% 2.63%
Dividend yield 0.00% 0.00%