Detecting is user has ultimate edition

We are discussing writing a plugin for Intellij. It came up that we would prefer to amke the plugin free to people who are using the ultimate edition and charge a small fee for people using the commuity edition. Is there any way to differentiate bwetween  someone  using the ultimate edition and someone using the community edition? Can we do this pre-purchare ? Is there something we can check for at runtime?


Thank you.