There are several factors working here, for one the company has other operations that are not behind like the Brazilian facility. It currently has sufficient cash for one year on hand. Barring another set back in production there really isnt much more risk here as the other operations are going.
At this price the stock is very volatile and wouldnt take much to spike the price. Adding to that volatility is very high Short Interest in this stock currently, If the number doesnt decline on the next report meaning new short position were taken even after others covered on the big dump then you can expect even more volatility on good news:
Settlement Date Short Interest Avg Daily Share Volume Days To Cover
10/31/2014 24,850,375 1,280,863 19.401275
10/15/2014 24,059,682 2,125,295 11.320632
9/30/2014 22,362,329 1,422,050 15.725417
9/15/2014 20,622,645 1,000,762 20.606943
8/29/2014 19,832,636 617,225 32.131939
8/15/2014 19,140,646 822,393 23.274330
7/31/2014 17,778,221 847,936 20.966466
