Sure. It's a research and development project, and we thought long and hard about it. It's a significant expense for us—tens of millions of dollars—and it was a difficult project to complete. We still believe strongly in that project, yet we still have the only two devices in the world to date. The manufacturer is pursuing other commercial options within other airports and other cities around the globe, but it still hasn't sold any of these accelerating walks.
If we don't invest, though, in research and development and take a chance on what seems to be a practical solution, technology will not advance. This was our attempt at making a calculated investment that we thought was a good investment in a technology that would survive.