| 10-K |
Annual report which provides a comprehensive overview of the company for the past year |
2018年3月9日 |
 Open Annual report which provides a comprehensive overview of the company for the past year in HTML. 开放年度报告，提供了过去一年中DOC文件中公司的全面概述。 Open Annual report which provides a comprehensive overview of the company for the past year in PDF file. Open Annual report which provides a comprehensive overview of the company for the past year in XLS file. Open Annual report which provides a comprehensive overview of the company for the past year in XBLR Viewer. 开放年度报告，在XBLR文件中提供了过去一年的公司的全面概述。 |
