| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | 10 Sep 2021 | 21 Jul 2020 | 000-55751 | |
| SC 13D | Open Document | Open Filing | 25 Oct 2019 | |||
| 4 | Open Document | Open Filing | 25 Oct 2019 | 16 Jun 2019 | 000-55751 | |
| 4 | Open Document | Open Filing | 18 Dec 2018 | 17 Jun 2017 | 000-55751 | |
| 3 | Open Document | Open Filing | 15 May 2017 | 06 Jun 2016 | 000-55751 |