| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | May 17, 2021 | May 13, 2021 | 001-08604 |
| 4/A | Open Document | Open Filing | FORM 4/A | Nov 16, 2020 | Nov 15, 2020 | 001-08604 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 16, 2020 | Nov 15, 2020 | 001-08604 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 21, 2019 | May 17, 2019 | 001-08604 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 21, 2018 | May 17, 2018 | 001-08604 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 24, 2017 | May 22, 2017 | 001-08604 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 2, 2016 | Jun 1, 2016 | 001-08604 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Oct 6, 2015 | Oct 1, 2015 | 001-12488 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Oct 6, 2015 | Oct 1, 2015 | 001-12488 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 28, 2015 | Sep 24, 2015 | 001-08604 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 13, 2015 | Aug 7, 2015 | 001-08604 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Oct 3, 2014 | Oct 1, 2012 | 001-12488 |