| Date | Form | Description | XBRL | Pages | |
|---|---|---|---|---|---|
| 05/18/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 05/11/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 05/11/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 04/03/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 12/19/17 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 09/27/17 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 09/07/17 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 09/05/17 | 3 | Initial statement of beneficial ownership of securities | 
       
   | 
  2 | |
| 08/17/17 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 06/15/17 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | 

