| Date | Form | Description | XBRL | Pages | |
|---|---|---|---|---|---|
| 07/31/19 | Statement of changes in beneficial ownership of securities | 
     PDF   
   | 
  1 | ||
| 07/31/19 | Statement of changes in beneficial ownership of securities | 
     PDF   
   | 
  1 | ||
| 07/31/19 | Statement of changes in beneficial ownership of securities | 
     PDF   
   | 
  1 | ||
| 07/26/19 | A correspondence can be sent as a document with another submission type or can be sent as a separate submission. | 
     PDF   
   | 
  4 | ||
| 07/26/19 | Quarterly report pursuant to Section 13 or 15(d) | 
     PDF   
   | 
  
           ZIP        | 
  99 | |
| 07/25/19 | Current report filing | 
     PDF   
   | 
  17 | ||
| 07/17/19 | SEC-generated letter | 
     PDF   
   | 
  2 | ||
| 07/02/19 | Statement of changes in beneficial ownership of securities | 
     PDF   
   | 
  1 | ||
| 06/11/19 | Current report filing | 
     PDF   
   | 
  3 | ||
| 05/31/19 | Specialized Disclosure Report filed pursuant to Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act relating to the use of conflict minerals (Rule 13p-1) | 
     PDF   
   | 
  19 |