I am not absolutely sure what it is, since it's bit 'deformed' from lack of light: it is way too tall, and internodes are far apart. You can see plant leaning toward any source of light. It may be in water retaining soil too, did you repot it since purchased?

It may be best if beheaded - cut down and re-rooted. It should be in fast draining mix and try to figure out how to give it much better light. Most succulents need hours of sunlight every day.

Check out this thread where you'll find photos and tips on how to do it (forget the very first post, it is aloe and just a bit different). Bt you need to make sure you have spot with better light - otherwise growth will be same....