WeWork's head of enterprise sales is out, leaving a role that's key to the coworking giant's turnaround plan vacant

· WeWork's head of enterprise sales has left the company, Business Insider has learned. 
· Grant McGrail spent three years at WeWork. 
· Working with major companies rather than freelancers and entrepreneurs is a key growth area for WeWork as the company seeks more stable revenue sources. 
· Last year, WeWork came in...