Broadway tuner “Next to Normal” will shutter in January after almost two years on the boards.The modestly scaled production, an unusually serious musical about a woman grappling with bipolar disorder, has posted moderate but largely consistent sales figures in its time on the Main Stem, taking in some $28 million so far. In March, producers announced the production had recouped its $4 million capitalization costs. “Normal” became one of the rare musicals to win the Pulitzer Prize earlier this year. Show also picked up a trio of 2009 Tonys. “Normal’s” circuitous road to the Rialto saw the tuner bow at the New York Musical Theater Festival in 2005 ahead of an Off Broadway production at Second Stage Theater in 2008. Later that year, a retooled version played Arena Stage in D.C. prior to the Broadway transfer. Musical, with tunes by Tom Kitt with book and lyrics by Brian Yorkey, was helmed by Michael Greif (“Rent”). David Stone (“Wicked”) leads the producing team. The Broadway production stars Marin Mazzie and Jason Danieley. A road incarnation, set to launch Nov. 23 at L.A.’s Ahmanson Theater, is toplined by Alice Ripley, who scored a Tony for her perf as the mentally unstable housewife. “Normal” is set to close Jan. 16 at the Booth Theater.