| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | Jul 21, 2021 | Jul 19, 2021 | 001-08097 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 4, 2021 | Apr 30, 2021 | 001-08097 |
| 4 | Open Document | Open Filing | FORM 4 | May 13, 2020 | May 11, 2020 | 001-08097 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 2, 2020 | Feb 27, 2020 | 001-08097 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 28, 2020 | Feb 26, 2020 | 001-08097 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 21, 2020 | Jun 3, 2019 | 001-08097 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 11, 2019 | Apr 11, 2019 | 001-05491 |
| 4 | Open Document | Open Filing | 4 | Apr 11, 2019 | Apr 11, 2019 | 001-08097 |
| 3 | Open Document | Open Filing | 3 | Apr 11, 2019 | Apr 11, 2019 | 001-08097 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 28, 2019 | Feb 26, 2019 | 001-05491 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 20, 2018 | Dec 18, 2018 | 001-05491 |
| 4 | Open Document | Open Filing | FORM 4 | Jul 5, 2018 | Jul 3, 2018 | 001-05491 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 1, 2018 | Feb 27, 2018 | 001-05491 |
| 3 | Open Document | Open Filing | FORM 3 | Jan 8, 2018 | Jan 1, 2018 | 001-05491 |