I could be mistaken, but I believe they were the ones to pioneer varifocal displays, a technology which has still yet to ship in an HMD. The earliest prototypes relied on physically moving the lens, where the latest prototypes are using some form of electrically charged lens that changes its focal distance based on voltage.

Once you start going down the rabbit hole of projects they've either announced or have been leaked it's easy to see how you could spend that kind of money, and that's only the stuff we know about.