| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Dec 17, 2021 | Dec 13, 2021 | 001-32998 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 20, 2021 | May 17, 2021 | 001-32998 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 22, 2021 | Mar 19, 2021 | 001-32998 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 17, 2021 | Mar 12, 2021 | 001-32998 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 13, 2020 | Mar 13, 2020 | 001-32998 |
| 4 | Open Document | Open Filing | FORM 4 | Sep 10, 2019 | Sep 9, 2019 | 001-32998 |
| 4 | Open Document | Open Filing | FORM 4 | May 25, 2016 | Mar 16, 2016 | 001-32998 |
| 4/A | Open Document | Open Filing | FORM 4/A | May 25, 2016 | Feb 18, 2016 | 001-32998 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 1, 2016 | Feb 29, 2016 | 001-32998 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 19, 2016 | Feb 18, 2016 | 001-32998 |
| 4 | Open Document | Open Filing | FORM 4 | Sep 9, 2015 | Sep 8, 2015 | 001-32998 |
| 4 | Open Document | Open Filing | FORM 4 | Sep 2, 2015 | Sep 1, 2015 | 001-32998 |
| 4 | Open Document | Open Filing | FORM 4 | Aug 21, 2015 | Aug 20, 2015 | 001-32998 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 19, 2015 | Feb 18, 2015 | 001-32998 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 17, 2014 | Dec 16, 2014 | 001-32998 |
| 4/A | Open Document | Open Filing | FORM 4 | Dec 2, 2014 | Nov 26, 2014 | 001-32998 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 1, 2014 | Nov 26, 2014 | 001-32998 |
| 3 | Open Document | Open Filing | FORM 3 | Aug 21, 2014 | Aug 20, 2014 | 001-32998 |