You should stay there as long as you can. Hubspot is now a company with a $2B market cap and they didn't move out of the Cambridge Innovation until they were a hundred plus people.
Coworking typically spaces provide phones, internet and other IT services, a kitchen with a coffee machine and snacks, janitorial services, a reception, security at the entrances, among other things. Also they have an attractive location that is usually commuter friendly. You'll need to take care of many of these things if you are on your own and you'll need your own staff to do this. Ask yourself if that is a worthwhile distraction for you now. If you aren't big enough its not worth it. Focus on the core issue of growing your business instead.