This is simply a natural rotation/cycling of the pps post catalyst (NDA). If you look at the 6 month chart, the pps has cycled below it's current value several times, and many times, for no reason. The approval is several months away, so traders are taking their money and playing other short term and binary plays. If you average additional shares between 7 and 8.50, you will be happy with the 11 to 14 in 4 to 5 months due to the run up alone. This is a buyout candidate, so traders beware during the interim.