You mentioned that you just got the plant. It may have died back due to shock from shipping if it was shipped. If so, it may spring back to life in 3 - 4 weeks. That's happened to me a few times.
Or it may have gotten too hot. Some Cephs seem to take heat better than others.
I agree with Laura. If you just got the plant, then its likely that it was shocked during shipment. I have both read and experienced this: It's not unusual for a ceph to lose all its leaves after being shipped.
"There is no pain as great as being alive,
no burden heavier than that of conscious life. "