I am banking on seeing higher gains. But, as I always do, I'd look at ladder buying -- whether you end up getting lower or higher prices at least you're managing risk.
Near-term (next couple quarters), the only two items that would really derail the stock would be not receiving approval in Europe and not continuing to gradually increase sales quarter over quarter. Analysts seem to think Europe is a done deal and that sales will continue to increase, but there's always the risk that they don't. If one of these two things were to occur, the price would take a significant hit.
At the same time, approval in Europe and gradually increasing sales could both be significant catalysts. Demonstrating that COGS are being reduced would also boost the price. Any positive indication on these items could squeeze shorts given the huge short interest in the stock too. And of course, being acquired is always a beneficial possibility.
So, personally, I think the rewards justify the risk now.