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Share-Based Payments - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2021 | Apr. 30, 2020
Total |  |
Outstanding, beginning balance (in shares) | 2,271,658 |
Granted (in shares) | 133,833 |
Exercised (in shares) | (663,444) |
Forfeited (in shares) | (7,000) |
Canceled (in shares) | (35,901) |
Expired (in shares) | (5,834) |
Outstanding, ending balance (in shares) | 1,693,312 | 2,271,658
Vested and expected to vest (in shares) | 1,693,312 |
Exercisable (in shares) | 1,298,688 |
Weighted Average Exercise Price |  |
Outstanding, beginning balance (in usd per share) | $ 3.23 |
Granted (in usd per share) | 9.21 |
Exercised (in usd per share) | 2.27 |
Forfeited (in usd per share) | 6.43 |
Canceled (in usd per share) | 4.03 |
Expired (in usd per share) | 10.80 |
Outstanding, ending balance (in usd per share) | 4.02 | $ 3.23
Vested and expected to vest (in usd per share) | 4.02 |
Exercisable (in usd per share) | $ 3.25 |
Weighted Average Remaining Contractual Life (Years) |  |
Outstanding (in years) | 5 years 7 months 28 days | 5 years
Outstanding, granted (in years) | 7 years 6 months 29 days |
Vested and expected to vest (in years) | 5 years 7 months 28 days |
Exercisable (in years) | 4 years 11 months 4 days |
Aggregate Intrinsic Value |  |
Outstanding | $ 11,975 | $ 10,663
Vested and expected to vest | 11,975 |
Exercisable | $ 10,173 |
Directors and Employees |  |
Total |  |
Outstanding, beginning balance (in shares) | 2,228,326 |
Granted (in shares) | 133,833 |
Exercised (in shares) | (662,285) |
Forfeited (in shares) | (7,000) |
Canceled (in shares) | (34,978) |
Expired (in shares) | 0 |
Outstanding, ending balance (in shares) | 1,657,896 | 2,228,326
Vested and expected to vest (in shares) | 1,657,896 |
Exercisable (in shares) | 1,289,104 |
Non- Employees |  |
Total |  |
Outstanding, beginning balance (in shares) | 43,332 |
Granted (in shares) | 0 |
Exercised (in shares) | (1,159) |
Forfeited (in shares) | 0 |
Canceled (in shares) | (923) |
Expired (in shares) | (5,834) |
Outstanding, ending balance (in shares) | 35,416 | 43,332
Vested and expected to vest (in shares) | 35,416 |
Exercisable (in shares) | 9,584 |

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