Don't let anyone talk you into a buy or a sell. You have to set goals and limits and stick to them. You have to decide whether you're a trader or an investor and use that decision to set those goals and limits.
I have a big stake in this company. But I also am blessed to own a successful business. If I lost every dime I put into CYGX, I'd be fine. It would hurt, but I'd be fine.
Never risk more than you can afford to lose. I tell all my friends who invest in developmental biotechs: don't put a penny in you can't wave good-bye to.