| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) | 
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | Jan 3, 2022 | Jan 1, 2022 | 001-35746 | 
| 4 | Open Document | Open Filing | FORM 4 | Aug 16, 2021 | Aug 16, 2021 | 001-35746 | 
| 4 | Open Document | Open Filing | FORM 4 | Aug 11, 2021 | Aug 9, 2021 | 001-35746 | 
| 4 | Open Document | Open Filing | FORM 4 | Feb 16, 2021 | Feb 11, 2021 | 001-35746 | 
| 5 | Open Document | Open Filing | FORM 5 | Feb 10, 2021 | Dec 31, 2020 | 001-35746 | 
| 4 | Open Document | Open Filing | FORM 4 | Apr 24, 2020 | Apr 23, 2020 | 001-35746 | 
| 4 | Open Document | Open Filing | FORM 4 | Feb 10, 2020 | Feb 6, 2020 | 001-35746 | 
| 5 | Open Document | Open Filing | FORM 5 | Feb 4, 2020 | Dec 31, 2019 | 001-35746 | 
| 4 | Open Document | Open Filing | FORM 4 | Feb 19, 2019 | Feb 14, 2019 | 001-35746 | 
| 5 | Open Document | Open Filing | FORM 5 | Feb 13, 2019 | Dec 31, 2018 | 001-35746 | 
| 4 | Open Document | Open Filing | FORM 4 | Dec 18, 2018 | Dec 15, 2018 | 001-35746 | 
| 4 | Open Document | Open Filing | FORM 4 | Sep 10, 2018 | Sep 7, 2018 | 001-35746 | 
| 4 | Open Document | Open Filing | FORM 4 | Aug 13, 2018 | Aug 9, 2018 | 001-35746 | 
| 5 | Open Document | Open Filing | FORM 5 | Feb 14, 2018 | Dec 31, 2017 | 001-35746 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 20, 2017 | Dec 15, 2017 | 000-26366 | 
| 4 | Open Document | Open Filing | FORM 4 | Dec 19, 2017 | Dec 15, 2017 | 001-35746 | 
| 3 | Open Document | Open Filing | FORM 3 | Dec 19, 2017 | Dec 15, 2017 | 001-35746 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 1, 2017 | Oct 31, 2017 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 30, 2017 | Oct 26, 2017 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 24, 2016 | Feb 23, 2016 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 16, 2016 | Feb 12, 2016 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 12, 2016 | Feb 10, 2016 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 10, 2016 | Feb 9, 2016 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 8, 2016 | Feb 5, 2016 | 000-26366 | 
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 17, 2015 | Jan 14, 2015 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 16, 2015 | Jan 14, 2015 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Oct 10, 2014 | Oct 8, 2014 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 21, 2014 | Aug 19, 2014 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 23, 2014 | Jul 16, 2014 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 11, 2014 | Jul 1, 2014 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 7, 2014 | Apr 4, 2014 | 000-26366 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 10, 2014 | Jan 8, 2014 | 000-26366 |