The $75 million Broadway musical “Spider-Man: Turn Off the Dark,” the most expensive theatrical production in history, will close in early January after months of declining ticket sales, one of the lead producers said on Monday night. A somewhat revamped version of the show is being planned for Las Vegas in 2015, according to the producer, Jeremiah J. Harris.

The decision to close “Spider-Man,” which gained worldwide publicity and notoriety because of cast injuries and backstage conflicts, as well as its enormous budget, came down to a hard financial reality after three years of performances, Mr. Harris said. While the musical emerged to become an audience favorite, grossing roughly $1.5 million a week in ticket sales for a time, “Spider-Man” eventually lost popularity. It grossed only $742,595 last week, or 48 percent of the maximum possible amount, with about three-quarters of its seats filled at the Foxwoods Theater.

“The show is, I would say, middling,” Mr. Harris said of box office sales. “We could run for probably another three to five years being stuck in the middle. We think it will play Las Vegas with a greater bang than it did in New York.” The producers are now in final negotiations for a space in Las Vegas, which Mr. Harris declined to identify.

Mr. Harris said the owners of the Foxwoods Theater did not invoke their stop clause, with which theater owners can force a show to close when its weekly grosses fall below a certain amount. “The decision to close was all ours,” he said. The owners of the Foxwoods, who are based in London, could not be immediately reached for comment.