| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 3 | Open Document | Open Filing | INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES | Oct 18, 2023 | Oct 16, 2023 | 001-36581 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 10, 2021 | Feb 8, 2021 | 000-53944 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 2, 2021 | Jan 15, 2021 | 000-53944 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 8, 2020 | Oct 27, 2020 | 000-53944 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 20, 2020 | Aug 18, 2020 | 000-53944 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 16, 2018 | Apr 12, 2018 | 000-53944 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 17, 2017 | Dec 21, 2016 | 000-31927 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 20, 2016 | May 18, 2016 | 000-53944 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 2, 2016 | Sep 1, 2015 | 000-53944 |
| 3 | Open Document | Open Filing | FORM 3 SUBMISSION | Nov 18, 2015 | Dec 1, 2012 | 000-31927 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 4, 2015 | Jul 31, 2015 | 000-53944 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 23, 2015 | Jul 16, 2015 | 000-53944 |