| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 1 | Oct 20, 2021 | ||
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 19, 2021 | Jul 1, 2021 | 000-55809 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 1, 2020 | Mar 30, 2020 | 000-55809 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 2, 2020 | Dec 31, 2019 | 000-55809 |
| SC 13D | Open Document | Open Filing | Mar 8, 2019 | |||
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 6, 2019 | Dec 31, 2018 | 000-55809 |