The document provides an overview of XBRL (eXtensible Business Reporting Language) including its definition, how it works, benefits, and the SEC mandate requiring public companies to tag their financial reports in XBRL format. It discusses the SEC timeline, reporting requirements, and lessons learned from the first few years of the mandate. It also outlines options for companies to outsource their XBRL implementation or do it in-house, and the key considerations for each approach.