Why the significance of the highest close since early October you ask? Short interest was about 100K shares at that time and exploded to 700k+ now. So every short who piled in in early October and since is now under water.
600K+ under water shorts on a thinly traded stock can make for a very explosive move upward. Market is at all time highs and these guys are stuck under water on a stock they have to PAY 11%+ to hold.