| Date | Form | Description | XBRL | Pages | |
|---|---|---|---|---|---|
| 04/10/19 | Initial statement of beneficial ownership of securities | 
     PDF   
   | 
  1 | ||
| 04/09/19 | Initial statement of beneficial ownership of securities | 
     PDF   
   | 
  3 | ||
| 04/09/19 | Initial statement of beneficial ownership of securities | 
     PDF   
   | 
  3 | ||
| 04/01/19 | Statement of changes in beneficial ownership of securities | 
     PDF   
   | 
  1 | ||
| 04/01/19 | Statement of changes in beneficial ownership of securities | 
     PDF   
   | 
  2 | ||
| 04/01/19 | Statement of changes in beneficial ownership of securities | 
     PDF   
   | 
  2 | ||
| 04/01/19 | Statement of changes in beneficial ownership of securities | 
     PDF   
   | 
  2 | ||
| 04/01/19 | Statement of changes in beneficial ownership of securities | 
     PDF   
   | 
  2 | ||
| 03/29/19 | Additional definitive proxy soliciting materials and Rule 14(a)(12) material | 
     PDF   
   | 
  4 | ||
| 03/27/19 | Additional definitive proxy soliciting materials and Rule 14(a)(12) material | 
     PDF   
   | 
  5 |