| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) | 
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Oct 7, 2021 | Oct 5, 2021 | 001-37670 | 
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Apr 15, 2021 | Apr 13, 2021 | 001-37670 | 
| 3 | Open Document | Open Filing | FORM 3 SUBMISSION | Dec 11, 2020 | Nov 30, 2020 | 001-37670 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 14, 2019 | Feb 13, 2019 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 27, 2018 | Dec 26, 2018 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 19, 2018 | Dec 18, 2018 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 16, 2018 | Aug 15, 2018 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 16, 2018 | Feb 14, 2018 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 17, 2017 | Aug 15, 2017 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 18, 2017 | Apr 15, 2017 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 9, 2017 | Feb 7, 2017 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 3, 2017 | Feb 1, 2017 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 17, 2016 | Aug 15, 2016 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 24, 2016 | May 20, 2016 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 19, 2016 | Apr 15, 2016 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 12, 2016 | Feb 10, 2016 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 3, 2016 | Feb 1, 2016 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 20, 2016 | Jan 15, 2016 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 16, 2015 | Dec 15, 2015 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 12, 2015 | Nov 11, 2015 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 17, 2015 | Sep 15, 2015 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 18, 2015 | Aug 15, 2015 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 16, 2015 | Jul 15, 2015 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 17, 2015 | Jun 15, 2015 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 19, 2015 | May 15, 2015 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 16, 2015 | Apr 15, 2015 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 13, 2015 | Feb 11, 2015 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 20, 2015 | Dec 1, 2014 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 16, 2014 | Sep 15, 2014 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 27, 2014 | Aug 26, 2014 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 19, 2014 | Aug 15, 2014 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 12, 2014 | May 7, 2014 | 001-12534 | 
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 11, 2014 | Feb 12, 2014 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 14, 2014 | Feb 12, 2014 | 001-12534 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 13, 2014 | Feb 11, 2014 | 001-12534 |