Here's why DexCom should be on your radar after the company's share price plunged recently.Attractive investment opportunities can sometimes arise when investors react emotionally to short-term events. Some of these events revolve around the earnings season, when a company releases financial results that fall short of analysts' expectations. It can be a miss involving just a penny or two, but the stock will still get sold down savagely. Such was the case for DexCom (DXCM 3.30%), a manufacturer of continuous ...