Capping off a turnaround year, FireEye (NASDAQ: FEYE) posted solid fourth-quarter results, which gave the stock a post-earnings bump. The cybersecurity company has been under the microscope lately, with the stock down 55% in the last three years, and a new CEO, Kevin Mandia, who has a plan to right the ship.As you'll see below, Mandia had a lot to say about the record-setting quarter and what's going right.