It may be shorts it may also just be people taking profits. It may also not even be a human being selling. From a Technical Analysis point of view when a bot sees a stock price go up 200-300% in a few weeks its just programmed to short based just on odds.

The stock did go parabolic. And if your a TA only trader not paying attention to fundamentals then you can see how shorts may pile in expecting healthy consolidation in the short time.

The upside for longs is an eventual short squeeze which is kind of what happened with the rise from 0.20 to $1 in my opinion and what started the run back up before the positive NR's

At the end of the day as the company performs and keeps hitting milestones and deals the longs will win out.