| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 24 Feb 2022 | 22 Feb 2022 | 001-36351 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 15 Dec 2020 | 14 Dec 2020 | 001-36351 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 25 Nov 2020 | 25 Nov 2020 | 001-36351 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 20 Nov 2020 | 18 Nov 2020 | 001-36351 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 24 Mar 2020 | 20 Mar 2020 | 001-36351 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 18 Mar 2019 | 14 Mar 2019 | 001-36351 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 20 Apr 2017 | 19 Apr 2017 | 001-36351 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 20 Apr 2017 | 19 Apr 2017 | 001-36351 |