| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 12, 2021 | May 6, 2021 | 001-34055 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 3, 2021 | Oct 22, 2020 | 001-34055 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 22, 2020 | Oct 22, 2020 | 001-34055 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 13, 2020 | Oct 8, 2020 | 001-34055 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 30, 2016 | Mar 28, 2016 | 000-22905 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 28, 2016 | Jan 26, 2016 | 000-22905 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 3, 2015 | Dec 1, 2015 | 000-22905 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 3, 2015 | Sep 1, 2015 | 000-22905 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 18, 2015 | Aug 17, 2015 | 000-22905 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 18, 2015 | Aug 17, 2015 | 000-22905 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 11, 2015 | Dec 31, 2014 | 000-28837 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 11, 2014 | Dec 1, 2014 | 000-28837 |