| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 3, 2021 | Jun 1, 2021 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Dec 28, 2020 | Dec 22, 2020 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Aug 26, 2020 | Aug 24, 2020 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Aug 11, 2020 | Aug 7, 2020 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 9, 2020 | Jun 5, 2020 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 5, 2020 | Jun 3, 2020 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 3, 2020 | Jan 29, 2020 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Aug 20, 2019 | Aug 16, 2019 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 7, 2019 | Jun 5, 2019 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 6, 2019 | Jun 4, 2019 | 000-21937 |
| 4/A | Open Document | Open Filing | FORM 4/A SUBMISSION | Jul 11, 2018 | Jun 6, 2018 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 22, 2018 | Jun 6, 2018 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 5, 2018 | Jun 5, 2018 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 30, 2018 | May 18, 2018 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 12, 2017 | Jun 6, 2017 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 10, 2016 | Jun 8, 2016 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 12, 2015 | Jun 10, 2015 | 000-21937 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Dec 19, 2014 | Dec 18, 2014 | 000-21937 |
| 4 | Open Document | Open Filing | Jul 11, 2014 | Jun 11, 2014 | 000-21937 | |
| 4 | Open Document | Open Filing | Mar 31, 2014 | Mar 28, 2014 | 000-21937 | |
| 4 | Open Document | Open Filing | Mar 31, 2014 | Nov 19, 2013 | 000-21937 |