Is your design documented? Is the implementation documented? If so, promote your current two guys to team leaders, hire some kick-ass programmers to finish the job. Pay a substantial incentive for hitting a mutually agreed deadline.

Oh, by the way, do you have a business plan? One with dates, budgets, revenue targets? If so, pull numbers out of that, do a discounted cash-flow analysis and a big chunk of that is your development budget. It's either doable or not.

If you have no documentation, no business plan, then you have nothing, just a dream morphing into a nightmare.