| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | 24 Feb 2022 | 19 Dec 2021 | 000-55896 | |
| SC 13D/A | Open Document | Open Filing | 24 Feb 2022 | |||
| SC 13D | Open Document | Open Filing | 20 Nov 2019 | |||
| 4 | Open Document | Open Filing | 19 Nov 2019 | 02 Apr 2019 | 000-55896 | |
| 3 | Open Document | Open Filing | 15 Feb 2019 | 05 Feb 2019 | 000-55896 |