| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| SC 13D/A | Open Document | Open Filing | Sep 20, 2022 | |||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jan 26, 2022 | Jan 21, 2022 | 000-52883 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 23, 2021 | Nov 2, 2021 | 000-52883 |
| SC 13D/A | Open Document | Open Filing | Aug 11, 2021 | |||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 11, 2021 | Jul 16, 2021 | 000-52883 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 10, 2021 | Apr 6, 2021 | 000-52883 |
| SC 13D/A | Open Document | Open Filing | May 10, 2021 | |||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 6, 2021 | Jan 20, 2021 | 000-52883 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jan 22, 2021 | Jun 5, 2020 | 000-52883 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 26, 2020 | Jan 16, 2020 | 000-52883 |
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 7 TO THE SCHEDULE 13D | May 26, 2020 | ||
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 6 TO THE SCHEDULE 13D | Nov 22, 2019 | ||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 20, 2019 | Nov 18, 2019 | 000-52883 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 6, 2018 | Jun 4, 2018 | 000-52883 |
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 5 TO THE SCHEDULE 13D | Jun 6, 2018 | ||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 23, 2018 | Dec 29, 2017 | 000-52883 |
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 4 TO THE SCHEDULE 13D | Mar 23, 2018 | ||
| 3 | Open Document | Open Filing | 3 | Aug 22, 2017 | Jul 6, 2017 | 000-52883 |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | Jul 6, 2017 | ||
| SC 13D/A | Open Document | Open Filing | SC 13D/A | May 18, 2017 | ||
| SC 13D/A | Open Document | Open Filing | SC 13D/A | May 11, 2017 | ||
| SC 13D | Open Document | Open Filing | SC 13D | Apr 27, 2017 |