It is frameless and consists of a fixed panel and a swinging door. The hinges are by C.R. Laurence and can swing in or out. The glass is tempered and 3/8 inch thick.

If I wanted to purchase and install his type of door on my shower,
A). Are there standard dimensions, and
B). What is the approximate cost installed?

Frameless glass is usually custom. I use anywhere from 24 to 30 inches wide. I select the height to align with something else in the room, such as the mirror/medicine cabinet or the door. I like everything to align when possible. I can't tell you the installed cost, but call a local glass company. Most glass companies (at least here in the Bay Area) do custom shower doors and will be able to give you an estimate.