This is just a 'speculative guess'. Looking back at the recent news, seems like the company might be gaining some traction with their products. If that's in fact the case, I'm thinking 'insider buying'.
I often won't play a stock moving on no news like this, that's why I have an eye out for unexpected filing drops here in the AH on a Friday...but if we get none, then my thinking in this holds...insiders / institutions. The run appears supported by a big outstanding short position...from what I'm garnering from previous runs / posts. This is the first that seems to have held up in the day.
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