Logikcull users with Project Administrator or Account Administrator access levels have access to the Activity log for documents, located in the Document Info panel. This log displays activity related to tags, culling activity, document notes, and user assignment. The most recent activity is displayed first in the list.
You can use the Activity log to see what sort of actions have been performed on a given document, by whom, on what day, and at what time. It's a great resource for tracking down questions about inconsistencies, identifying the history of a document's coding, or just performing high-level quality control.
Activity prior to the release of this feature (mid-Q1 2015) is not available.