I had day traded that ticker a few months back - Did not follow it after that - It has a very low float so I'd be a little cautious when trying to swing trade it.
HALO is becoming expensive - It wont be as good for trading as it used to be - So I found cheaper alternatives - XOMA (found and posted in the $4 range, may have PMed you, dont remember now) and IDRA (found recently).