Health-tech firm Livongo raised another $105 million after doubling its revenue and staff. : Livongo Health, a medical-technology company run by Glen Tullman, raised another $105 million from investors and is closing in on unicorn status, with a valuation that tops $800 million. Revenue and staff have more than doubled in the past year at the Chicago-based company as its diabetes-monitoring device gains traction. Annual sales top $60 million. Livongo has about 90 employees in Mountain View, Calif.; headcount in Chicago is about 70 but growing faster than Silicon Valley, where the war for talent is more intense.