A number of companies will look at outside ideas without a prototype. They do want a detailed drawing and a list of benefits for your idea. I rarely make a prototype unless they request it or I need to prove my concept. Some ideas are simply enough to know they will work just from a drawing.
You have to have a good pitch for your idea to get a company interested to learn more about it. You can't just say I have a better spoon. You have to list why it's a better spoon and what are its benefits. What about it will make a consumer want to buy it?
No matter what you send a company if they like it and want to go forward you can be sure it will get changed in some manner. It is what I call "What started out a Dog ends up a Cat" syndrome. The company may know a better shape or material to use to cut costs that you weren't aware of.
Here is a link to another inventorspot forum where you can see a presenation sheet I sent a company who licensed my Pizza Scissors idea based on that pitch. That is all I sent to get them inetrested and made the sale.viewtopic.php?t=74