| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 2, 2021 | May 31, 2021 | 000-56044 |
| 4 | Open Document | Open Filing | 4 | Sep 15, 2020 | Sep 14, 2020 | 000-56044 |
| 4 | Open Document | Open Filing | 4 | Sep 3, 2020 | Sep 2, 2020 | 000-56044 |
| 3 | Open Document | Open Filing | 3 | Jun 28, 2019 | Jun 28, 2019 | 000-56044 |