Even a single fund shedding 300k - 500k shares under some sort of duress could cause this kind of tanking action. Volume is just not high enough to absorb that without some buyers standing by. I thought there would be more buying interest but apparently everyone got their fill in the secondary.
This is the same stock that tanked from $14 to $6 for no good reason. It is volatile. Long term holders at any of these prices will be rewarded handsomely of course.