It's not completely clear to me if your prototype is currently FPGA code, or maybe sensor hardware. For silicon IP a few questions might be:
Are there any customers who might reasonably deploy with your tech on FPGA?
Can you port your prototype to a GPU implementation? Would that open markets/customers to you?
Do you expect customers to port to a silicon implementation of your IP?
Other question might be, how clear of IP is your prototype. Do you own the full copyrights to the FPA code you intend to sell? Does it infringe on any patents?
Is it worth licensing into silicon IP "catalog" type companies? (This might include the FPGA vendors themselves too...)