Probably not. We’ve had companies start with $1M+ in revenue (here’s their blog post) and $1M+ in funding (read about it). We’ve had companies start with fully developed products and we helped them with business model, introductions, financing, and more.
We’ve even had companies go through our program once (Sphero, Boulder ‘10), sell millions of units, get up to $40M in funding, and then go through another one of our programs (Disney Accelerator ‘14). It depends on a number of factors including the product/service, the market, the program and the business strategy.
Likewise, nothing is too early. We’ve accepted companies with no more than an idea, a dream, and maybe a dog. Do the work. Ask any past founder by contacting them at founders@ their domain name – they’ll be happy to answer any questions that you might have.