| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | Aug 17, 2021 | Aug 13, 2020 | 000-53166 | |
| SC 13D/A | Open Document | Open Filing | Dec 2, 2020 | |||
| 4 | Open Document | Open Filing | Dec 1, 2020 | Nov 29, 2020 | 000-53166 | |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 20, 2019 | Jan 5, 2018 | 000-53166 |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | Sep 18, 2019 | ||
| SC 13D/A | Open Document | Open Filing | SC 13D/A | Nov 9, 2017 | ||
| SC 13D/A | Open Document | Open Filing | SC 13D/A | Sep 8, 2017 | ||
| SC 13D/A | Open Document | Open Filing | SC 13D/A | May 4, 2017 | ||
| 4/A | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 7, 2017 | Dec 8, 2016 | 000-53166 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Dec 12, 2016 | Dec 8, 2016 | 000-53166 |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | Nov 15, 2016 | ||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 14, 2016 | Nov 10, 2016 | 000-53166 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 23, 2016 | Feb 22, 2016 | 000-53166 |
| SC 13D | Open Document | Open Filing | SC 13D | Dec 18, 2015 | ||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Dec 9, 2015 | Dec 7, 2015 | 000-53166 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 12, 2015 | Jul 24, 2015 | 000-53166 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 22, 2015 | Jun 24, 2015 | 000-53166 |