| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | Jun 11, 2021 | Jun 9, 2021 | 000-51891 | |
| 4 | Open Document | Open Filing | Mar 4, 2019 | Feb 28, 2019 | 000-51891 | |
| 4 | Open Document | Open Filing | Dec 6, 2018 | Dec 4, 2018 | 000-51891 | |
| 4 | Open Document | Open Filing | Oct 3, 2018 | Oct 2, 2018 | 000-51891 | |
| 4/A | Open Document | Open Filing | Sep 27, 2018 | Aug 15, 2018 | 000-51891 | |
| 4 | Open Document | Open Filing | Aug 22, 2018 | Aug 21, 2018 | 000-51891 | |
| 4 | Open Document | Open Filing | Aug 21, 2018 | Aug 20, 2018 | 000-51891 | |
| 4 | Open Document | Open Filing | Aug 17, 2018 | Aug 15, 2018 | 000-51891 | |
| 4 | Open Document | Open Filing | Jul 17, 2018 | Jul 13, 2018 | 000-51891 | |
| 4 | Open Document | Open Filing | Jul 12, 2018 | Jul 10, 2018 | 000-51891 | |
| 4 | Open Document | Open Filing | Jun 28, 2018 | Jun 26, 2018 | 000-51891 | |
| 4 | Open Document | Open Filing | Jun 27, 2018 | Jun 25, 2018 | 000-51891 | |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 1, 2017 | May 31, 2017 | 000-51891 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 14, 2017 | Feb 10, 2017 | 000-51891 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 28, 2016 | Mar 24, 2016 | 000-51891 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 13, 2015 | Mar 12, 2015 | 000-51891 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 12, 2014 | Nov 10, 2014 | 000-51891 |
| 4 | Open Document | Open Filing | FORM 4 | Oct 10, 2014 | Oct 10, 2014 | 000-51891 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Sep 26, 2014 | Sep 26, 2014 | 000-51891 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Sep 12, 2014 | Sep 12, 2014 | 000-51891 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Sep 2, 2014 | Aug 29, 2014 | 000-51891 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 13, 2014 | Aug 4, 2014 | 000-51891 |