| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 19, 2021 | Aug 13, 2021 | 001-34024 |
| 4 | Open Document | Open Filing | Jan 8, 2019 | Dec 31, 2018 | 001-34024 | |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 11, 2018 | May 4, 2018 | 001-34024 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 19, 2016 | Jan 31, 2013 | 001-34024 |