Emerging Space: The Evolving Landscape of 21st Century American Spaceflight, PDF, NASA Office of the Chief Technologist
"Crowdfunding offers space organizations avenues for fundraising outside traditional institutional methods. Sites like Kickstarter.com, Rockethub.com, and Indiegogo.com allow space companies to tap the financial resources of private citizens interested in space exploration. In addition to providing crucial funds for the companies, crowd funding allows citizens to directly engage in space exploration by funding the projects that interest them. The number of these projects continues to grow. Table 4 provides a few prominent examples known at the time of printing. ... ISEE-3, a NASA probe launched in 1978, became the first spacecraft in deep space to be operated by a private-sector organization thanks in part to a crowd funding campaign."
Note: When you add ISEE-3 Reboot Project ($160K) and Lunar Orbiter Image Recovery Project ($62K) together (both conducted by the same team) over $222,000 has been raised via crowdfunding. Click on image to enlarge.