Xconomy -- Biogen Idec, after weeks of speculation in the local real estate market, has confirmed it is considering options to move its headquarters back from the suburbs to Cambridge, MA, as CEO George Scangos seeks to foster a more close-knit culture between the company’s R&D and commercial operations. “We’re working on it. We’ll see if it’s practical,” Scangos says. “We don’t have anything signed. We are exploring a number of options.”