| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 3, 2021 | Nov 3, 2021 | 001-41002 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 21, 2019 | Feb 20, 2019 | 000-51142 |
| 4/A | Open Document | Open Filing | FORM 4/A SUBMISSION | Aug 13, 2018 | Aug 7, 2018 | 000-51142 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Aug 8, 2018 | Aug 7, 2018 | 000-51142 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 12, 2018 | Mar 9, 2018 | 000-51142 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 23, 2017 | Feb 22, 2017 | 000-51142 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 26, 2016 | Feb 24, 2016 | 000-51142 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Aug 20, 2015 | Aug 19, 2015 | 000-51142 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Apr 30, 2015 | Apr 29, 2015 | 000-51142 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 9, 2015 | Mar 5, 2015 | 000-51142 |
| 3 | Open Document | Open Filing | FORM 3 SUBMISSION | Jun 9, 2014 | Jun 3, 2014 | 000-51142 |