| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | Dec 21, 2021 | Dec 15, 2021 | 000-23702 |
| 4/A | Open Document | Open Filing | Jun 3, 2021 | Nov 1, 2019 | 000-23702 | |
| 4 | Open Document | Open Filing | May 28, 2021 | Nov 1, 2019 | 000-23702 | |
| 4 | Open Document | Open Filing | May 11, 2021 | May 7, 2021 | 000-23702 | |
| 4 | Open Document | Open Filing | Jan 6, 2020 | Jan 2, 2020 | 000-23702 | |
| 4 | Open Document | Open Filing | Dec 17, 2019 | Dec 16, 2019 | 000-23702 | |
| 4 | Open Document | Open Filing | Nov 5, 2019 | Nov 1, 2019 | 000-23702 | |
| 4 | Open Document | Open Filing | FORM 4 | Aug 16, 2018 | Aug 14, 2018 | 000-23702 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 19, 2018 | Mar 15, 2018 | 000-23702 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 19, 2017 | Dec 18, 2017 | 000-23702 |
| 4 | Open Document | Open Filing | FORM 4 | Jun 14, 2017 | Jun 12, 2017 | 000-23702 |
| 4 | Open Document | Open Filing | FORM 4 | Jan 4, 2017 | Jan 3, 2017 | 000-23702 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 19, 2016 | Dec 16, 2016 | 000-23702 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 14, 2016 | Nov 10, 2016 | 000-23702 |
| 4 | Open Document | Open Filing | FORM 4 | Aug 12, 2016 | Aug 12, 2016 | 000-23702 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 16, 2016 | Mar 15, 2015 | 000-23702 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 13, 2015 | Mar 11, 2015 | 000-23702 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 21, 2014 | Nov 20, 2014 | 000-23702 |
| 4 | Open Document | Open Filing | FORM 4 | Jan 16, 2014 | Jan 15, 2014 | 000-23702 |