What is the $300,000 ski crash case against actress Gwyneth Paltrow?

Gwyneth Paltrow recently testified in court after retired optometrist Terry Sanderson sued her for $300,000, claiming that skiing crash with the Hollywood actress in 2016 left him with broken ribs and permanent brain damage. Paltrow has countersued for $1, plus attorneys' fees. She testified that the accident wasn't her fault, adding it was Sanderson who crashed into her from behind.