| Date | Form | Description | XBRL | Pages | |
|---|---|---|---|---|---|
| 12/20/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 12/20/18 | 3 | Initial statement of beneficial ownership of securities | 
       
   | 
  2 | |
| 12/17/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 12/10/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  5 | |
| 11/30/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 11/28/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 11/16/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 09/28/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 09/12/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 08/16/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | 

