Significant Accounting Policies - Summary of Amortization Expenses (Detail) - USD ($) |
May 31, 2018 |
May 31, 2017 |
|---|---|---|
| Accounting Policies [Abstract] | ||
| 2019 | $ 104,583 | |
| 2020 | 104,583 | |
| 2021 | 104,583 | |
| 2022 | 104,583 | |
| 2023 | 78,436 | |
| Thereafter | 0 | |
| Total | $ 496,768 | $ 601,351 |