| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 24 Jun 2021 | 22 Jun 2021 | 000-03978 |
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 5 TO THE SCHEDULE 13D | 24 Jun 2021 | ||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 21 Jun 2021 | 17 Jun 2021 | 000-03978 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 09 Jun 2021 | 07 Jun 2021 | 000-03978 |
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 4 TO THE SCHEDULE 13D | 27 May 2021 | ||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 25 May 2021 | 21 May 2021 | 000-03978 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 08 Oct 2020 | 05 Oct 2020 | 000-03978 |
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 3 TO THE SCHEDULE 13D | 07 Oct 2020 | ||
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 2 TO THE SCHEDULE 13D | 17 Jul 2020 | ||
| SC 13D/A | Open Document | Open Filing | 26 Sep 2019 | |||
| SC 13D | Open Document | Open Filing | 26 Dec 2018 | |||
| SC 13D | Open Document | Open Filing | 26 Dec 2018 |