Who's fault is this: parked on the st and a biker crashes into your car?

OK. I parked on a street corner legally, and made sure there's nothing coming from either direction before opening my car door to get out. Just when I opened it half way, a man on a bike came from around the corner and collided with my car door. He fell, and my car door is damaged. Who's fault is this? Can I get compensated for my car door repair? Would I have to go to court for this?