That just means the plant is done flowering. Go ahead and cut the flower stem down as far as you can. Give it fair light (next to a window....it can't be in the middle of a room), or even stick it outside in a protected area--covered porch, i.e.--where it can get morning sun til noon, or evening sun from 3-sunset. For it to rebloom for you, it must get a nighttime drop in temperature of about 15F, which is not a problem outside, especially during the fall.

Good luck with your new 'chid!
Chris