| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 1, 2021 | Jun 30, 2021 | 000-55394 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Sep 18, 2020 | Sep 18, 2020 | 000-55394 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 7, 2020 | Jul 3, 2020 | 000-55394 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 21, 2020 | Apr 21, 2020 | 000-55394 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 14, 2020 | Feb 14, 2020 | 000-55394 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 3, 2019 | Jul 3, 2019 | 000-55394 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 14, 2019 | Feb 14, 2019 | 000-55394 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 9, 2018 | Nov 7, 2018 | 000-55394 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 6, 2018 | Jul 3, 2018 | 000-55394 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 15, 2018 | Feb 14, 2018 | 000-55394 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Sep 27, 2017 | Jul 25, 2017 | 000-55394 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 3, 2017 | Jul 3, 2017 | 000-55394 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 11, 2017 | Apr 7, 2017 | 000-55394 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 4, 2015 | Mar 4, 2015 | 000-55394 |