I wouldn't read much to anything into any price movement of late. Volume has been way too thin to read anything into price movement.
December's are always full of people re-shuffling their portfolios, selling solely for capital gain or capital loss purposes (depending on their tax situation), buying into stocks they feel will do in the upcoming year, etc.
2013 will be a GREAT year for NVIV in my opinion, but equally IMO we will not see anything worthy of mention up or down until FDA time during hopefully Q1. And most assuredly, when FDA time comes we will see very significant volume.
Sentiment: Strong Buy