Well, I think that first off, Craig, is as you know I come from the telecom industry. And it's always been my belief that Plug is in the very early stages of cost downs for fuel cells. I started working wireless in 1983 and I've told this story before. The products that I designed back then, now you can buy for 1/10 the cost with 10 times the performance. And I was working with state of-the-art activity. Plug is in a similar position. When you go from stack design, from changing loadings, different plate technologies, to how one sizes and uses the lithium batteries associated with our stacks, which are built into the system a higher level of electrical integration. And probably just as important, we really think about products and service together. We view every fuel cell as a future part of the Internet of Things. In the control center that we have in place here today, we eventually expect that we'll be able to talk directly to every unit in the field, control every unit in the field, know what every unit in the field is doing in real time. We know a lot today, but not only do we see tremendous cost downs in kind of the base platforms now, but we also see tremendous cost down, higher quality products, more efficient products. If you look at our value proposition, our stacks and systems using flux-backs of 15% to 20% use less hydrogen: than the present systems. If you think about 15% to 20% less hydrogen:, that's a significant, that's makes the value proposition stronger. So when we think about cost downs, we think about it very holistically, how to drive down the cost of all elements that touch GenDrive during its lifetime, from hydrogen, from stacks, from service costs. We also have continues activity on how to simplify and reduce the cost of hydrogen, infrastructure, which we believe can become a significant business for Plug in the future. Because I don't think anybody has built 35, 36-plus systems that are actually used every day, and has delivered -- as I'm looking at my chart on the wall across the hallway here -- has already delivered 2.6 million kilograms of hydrogen.