The self-driving car company Cruise laid off nearly a quarter of its workforce Thursday following a series of safety mishaps and permit suspensions by the business owned by General Motors.

The layoffs spanned 900 workers, or 24% of its full-time employees in commercial operations and related corporate roles, Cruise said. The company’s business has struggled since an October incident where a self-driving Cruise collided with a woman and dragged her 20 feet after she had already been hit by another car.