| Date | Form | Description | XBRL | Pages | |
|---|---|---|---|---|---|
| 10/05/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 10/05/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 10/04/18 | SC TO-I/A | Issuer tender offer statement | 
       
   | 
  8 | |
| 09/21/18 | 8-K | Current report filing | 
       
   | 
  2 | |
| 09/12/18 | 4/A | Statement of changes in beneficial ownership of securities | 
       
   | 
  1 | |
| 09/11/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 09/11/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 09/11/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 09/11/18 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 09/07/18 | SC TO-I/A | Issuer tender offer statement | 
       
   | 
  26 | 


