| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 04 Feb 2022 | 31 Jan 2022 | 000-54835 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 06 Apr 2021 | 01 Apr 2021 | 000-54835 |
| 4/A | Open Document | Open Filing | 28 Feb 2020 | 20 Dec 2019 | 000-54835 | |
| 4 | Open Document | Open Filing | 23 Dec 2019 | 20 Dec 2019 | 000-54835 | |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 11 Dec 2018 | 06 Dec 2018 | 000-54835 |
| 4 | Open Document | Open Filing | 4 | 11 Oct 2018 | 09 Oct 2018 | 000-54835 |
| 4 | Open Document | Open Filing | 4 | 03 Jan 2018 | 29 Dec 2017 | 000-54835 |
| 4 | Open Document | Open Filing | 4 | 06 Mar 2017 | 03 Mar 2017 | 000-54835 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 02 Feb 2017 | 31 Jan 2017 | 000-54835 |
| 4 | Open Document | Open Filing | 4 | 04 Apr 2016 | 28 Mar 2016 | 000-54835 |
| 4 | Open Document | Open Filing | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP | 11 Mar 2016 | 09 Mar 2016 | 000-54835 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 05 Jan 2016 | 30 Dec 2015 | 000-54835 |
| 4 | Open Document | Open Filing | 4 | 21 Sep 2015 | 18 Sep 2015 | 000-54835 |
| 3/A | Open Document | Open Filing | 3/A | 09 Sep 2015 | 25 Aug 2015 | 000-54835 |
| 3 | Open Document | Open Filing | 3 | 04 Sep 2015 | 04 Sep 2015 | 000-54835 |