It sounds obvious, but finding truly great ideas that are commercially viable to massive audience take a lot of time. Therefore we say 'no' a lot more than we say 'yes'.
Even more important than a great idea, is finding great people to develop that idea into a operational business. That doesn't mean having all the skills today, just the right attitude & motivation to learn along the way.
We're looking for more than ideas on paper, we typically work with companies that have at least working prototypes. That means at least a minimal viable product (MVP), beta or production product.
Investments vary on the stage of the business and, of course, the market potential of the individual company. We look at both early-stage "seed" investments, and later-stage "growth" investments. Usually we like to take minority positions without too many bells and whistles. We want to keep the entrepreneurs and founders motivated with enough equity upside that everyone prospers with the success of the company.