Hi Dew,
In the short term, this pop was probably based on a cup and handle break out, that formed due to apparently increased appreciation of the fundamental value here(e.g.large Baker Bros purchases,updates that have only confirmed the continuation of favorable results, Michael Weiss's recent no charisma, just the facts, "the street.com" interview).
In other words, I think you know the story by now, but it seems like a lot of other people are finally starting to notice.
I'd be very surprised(short of some clinical reversal(which I don't expect)), if this stock isn't in the $10+ range in the next few months.
Full disclosure, I'm very long this one.
Best,
bw