| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | May 20, 2021 | May 19, 2021 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Jan 21, 2021 | Jan 20, 2021 | 000-31977 |
| 5 | Open Document | Open Filing | FORM 5 | Jan 11, 2021 | Dec 31, 2020 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Sep 8, 2020 | Sep 8, 2020 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Aug 18, 2020 | Aug 18, 2020 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | May 14, 2020 | May 14, 2020 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 7, 2020 | Feb 5, 2020 | 000-31977 |
| 5 | Open Document | Open Filing | FORM 5 | Jan 6, 2020 | Dec 31, 2019 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | May 17, 2019 | May 15, 2019 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 8, 2019 | Feb 6, 2019 | 000-31977 |
| 5 | Open Document | Open Filing | FORM 5 | Jan 14, 2019 | Dec 31, 2018 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 27, 2018 | Nov 23, 2018 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 21, 2018 | Nov 21, 2018 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | May 17, 2018 | May 16, 2018 | 000-31977 |
| 5 | Open Document | Open Filing | FORM 5 | Jan 17, 2018 | Jan 17, 2018 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 4, 2017 | Dec 1, 2017 | 000-31977 |
| 5 | Open Document | Open Filing | FORM 5 | Jan 10, 2017 | Dec 31, 2016 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Jun 10, 2016 | Jun 10, 2016 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 22, 2016 | Mar 21, 2016 | 000-31977 |
| 5 | Open Document | Open Filing | FORM 5 | Jan 25, 2016 | Dec 31, 2015 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 20, 2015 | Mar 19, 2015 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 20, 2014 | Mar 19, 2014 | 000-31977 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 18, 2014 | Mar 14, 2014 | 000-31977 |
| 3 | Open Document | Open Filing | FORM 3 | Feb 6, 2014 | Feb 1, 2014 | 000-31977 |