It's the end of 2012, and that means it's time to take a look back at the year in retrospect. We'll be reading through the naughty and nice lists (we've already checked them twice), counting down the 25 best-performing stocks and the 25 worst-performing stocks in the health care sector this year.

In this segment, Motley Fool health care analysts David Williamson and Max Macaluso take a look at No. 24 on the nice list, GenMark Diagnostics (NASDAQ:GNMK), and how this company left investors with more than a little something extra in their stockings this year.