Not sure about the details of this particular grant, but with federal grants usually you don't get a million dollar check to develop your idea. The money is divided in phases each requiring a set of milestones to be completed, reviewed and approved for you to have access to more resources. The total grant may be a million, but you may first get 100K and 6 months to show a working version then the next phase if approved gives you 200K more and so on.