| Date | Form | Description | XBRL | Pages | |
|---|---|---|---|---|---|
| 03/08/18 | 4 | Statement of changes in beneficial ownership of securities |   | 2 | |
| 02/28/18 | S-3ASR | Automatic shelf registration statement of securities of well-known seasoned issuers |   | 45 | |
| 02/28/18 | 10-K | Annual report pursuant to Section 13 and 15(d) |   |       | 142 | 
| 02/23/18 | 4 | Statement of changes in beneficial ownership of securities |   | 1 | |
| 02/23/18 | 4 | Statement of changes in beneficial ownership of securities |   | 1 | |
| 02/23/18 | 4 | Statement of changes in beneficial ownership of securities |   | 1 | |
| 02/23/18 | 4 | Statement of changes in beneficial ownership of securities |   | 1 | |
| 02/23/18 | 4 | Statement of changes in beneficial ownership of securities |   | 1 | |
| 02/23/18 | 4 | Statement of changes in beneficial ownership of securities |   | 1 | |
| 02/23/18 | 4 | Statement of changes in beneficial ownership of securities |   | 1 | 
