It’s the end of an unusual era in transportation. Fast Company has learned that the Segway brand will stop producing the Segway PT (Personal Transporter) at its Bedford, New Hampshire plant, where most production has taken place, on July 15th. The move will result in 25 people being laid off, and reflects the long-term struggles of a product that was supposed to revolutionize transportation, but never really took off.

Inventor Dean Kamen launched the Segway PT in December 2001 with promises that it would revolutionize city transport — the self-balancing two-wheeler was supposed to cover the middle ground between walking and driving in a way that bikes couldn’t. However, it never sold in huge numbers, managing just 140,000 units in nearly 20 years. It ultimately found the most use among security teams (immortalized by Paul Blart: Mall Cop) and tourists. Kamen sold the company in 2009, and Chinese mobility firm Ninebot acquired it in 2015.