Around 11 p.m., my neighbor and I were outside talking. She noticed a light somewhat high in the sky that was moving. We observed that it was not a plane as a plane is usually distinguished by its flashing lights. Planes were also in the vicinity.

It disappeared for approximately 5 minutes.  We thought it was because clouds had come through.  The sky opened and the stars were visible again.  However, it reappeared and moved in a zig-zag type pattern across the sky.  It clearly had a trajectory that went west of our complex.  
I wondered if it was a drone, but why would drones be used late in the evening.  There was no sound from this object.