It is a Dendrobium. They like warmth, very bright, indirect light, and to be watered well but dry out quickly. If given these conditions, they are usually pretty easy.
In addition to Leafmite's suggestions I suggest you remove it from the outer ceramic pot. Now its finished flowering. Dens like plenty of air movement around their roots. You might like to also consider fertilizer weak and often with a pinch of Epson salts in the first dosing
In this part of the world (New Zealand ) we tend to only dry out Dens if we want them to spike. We or at least I do alter the watering frequency during the winter months.down to once a week.
The shape of the flower may indicate that there is Den bigibbum in the background some where. I see you belong to an orchid society see if you can access Orchid Wiz and you will see a flower that's pretty close.If this is the case then the plant is behaving naturally as this species tends to drop some leaves once flowering is over.
today, I had remove the ceramic pot from the plant. and cut off some dead roots. attached photo for your reference. hope to get more info. I live in Singapore, so the climate is warm and humid through out the year. As I am very new to Orchid as my daughter love it alot and was very sad when she saw the sick orchid without leaves. attached photo for further investigation. I will be buying more charcoal to put into the plant.
I am not a specific Dendrobium grower, but for me the plant looks healthy without signs of rot, just being in the dormant stage - that's what bulbs are for.