I don't think you should share it with anyone, especially not potential customers - who knows what they might do? Paranoia is such a debilitating condition that he stops people achieving any kind of success and leaves bitterness when someone else launches a product that obviously stole your idea - am I right?
Ryan, one of your planning moves is to think about competition, both launched and potential, and what their response might be assuming you launch a product. Think through your product/service proposition and why your approach provides a better solution than whatever your target market is doing now. If your immediate response is "but there is no competition - no one is doing this" then think again. EVERYTHING has competition as no-one is holding onto their cash until your think launches. Either they have an inadequate solution today or they are spending their money somewhere else because they haven't had their need framed by your idea.
Your competitive advantage is thinking through the delivery of your product or service, the infrastructure it has to operate in, the kind of usage models and how you make revenue. Know your strengths and how your first product more completely meets the market need. Explore those needs through social media and market research to test your assumptions and refine your ideas. Know the likely competitive response and how you can counter - remember that you are expecting them but they aren't expecting you!
Then go make it. You can talk around the needs without revealing your proposition and still get a lot of valuable feedback. Observe and ask. Then build a team you can trust and go make something. Ultimately if the only thing you have is a half formed idea then no-one is going to steal that, but they may well finish it!