The detailed views shows in each cell:

• The validation status/rate
• The date of last activity [relative when recent: 2 days ago, with details in a tooltip]
• The time between when the user started and now or when he validated this activity
• How many messages in the forum
• How many hints
• How many attempts.

Clicking on a cell opens the same bubble as in the compact view, but without the details, since they are already visible.