| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 3 | Open Document | Open Filing | FORM 3 | May 13, 2021 | May 13, 2021 | 000-56259 |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | Jan 27, 2017 | ||
| SC 13D | Open Document | Open Filing | SC 13D | Jan 17, 2017 | ||
| 3/A | Open Document | Open Filing | FORM 3/A | Mar 26, 2014 | Apr 29, 2011 | 000-54376 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jan 17, 2014 | Jan 16, 2014 | 001-08594 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jan 8, 2014 | Dec 17, 2013 | 001-08594 |