For a private company, it looks like to me they're making steady progress offering innovative products that are wanted. Somebody(s) in their leadership seems to know what they're doing!
Wouldn't surprise me if someone bought them even before they go public.
Of course we know nothing about their financials ... yet. But if the energy storage wave really hits over the next few years, I think they'll be surfing it just fine.
And I know it's silly, but I've always found a lot of technical details on the website and Spec pdfs that I've really appreciated, and that I thought was well done (though admittedly I'm no power expert!!)