Volume of 5 million shares in first half of today's session is already the biggest daily volume since that huge run from $8 to $40 during March 2004.
After the most recent big jump from $2.50 to $5 at the end of last November, chart has been tracing out a huge ascending triangle with repeated overhead resistance at $5. This is the breakout from that pattern. Obvious preliminary short-term target is another double to $10.