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Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Details)

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Subsequent Events (Details) - USD ($)
3 Months Ended 9 Months Ended
Feb. 26, 2021
Jan. 31, 2021
Jan. 31, 2021
Apr. 30, 2020
Jan. 31, 2020
Subsequent Event [Line Items]
Vesting of outstanding shares 1,260,213 1,260,213 2,776,778
Stock Incentive Plan and Stock Option Grants to Employees and Directors
Subsequent Event [Line Items]
Vesting of outstanding shares 2,740,539
Weighted-average exercise price of unvested shares (in dollars per share) $ 6.13 $ 6.13 $ 4.62
Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Vested (in shares) 131,250 206,109
Subsequent Event | Former CFO
Subsequent Event [Line Items]
Severance benefits $ 150,000
Bonus for prior fiscal year 18,563
Bonus for current fiscal year 33,750
Relocation costs reimbursement $ 96,250
Subsequent Event | Former CFO | Stock Incentive Plan and Stock Option Grants to Employees and Directors
Subsequent Event [Line Items]
Vesting of outstanding shares 13,892
Weighted-average exercise price of unvested shares (in dollars per share) $ 5.12
Subsequent Event | Former CFO | Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Vested (in shares) 80,251