I'm guessing you bought near the top. I've seen this before and been caught at the top of one of these bear raids as well. It sucks. My advice is to accept that you've lost "some" money, and sell early, and minimize your loss. You don't want to be the last one out when this bottoms at $4.
I did. This is a Bear Raid plain and simple. I hold no position neither long nor short in CLSN. I'm just calling it like it is. And if you were unfortunate to buy near the top yesterday, I'm suggesting you exit. The Bear Raid will likely take this down to $6 or so by Monday.