Computer-vision chipmaker Ambarella (AMBA) edged above Wall Street's targets for its fiscal first quarter but disappointed with its outlook. AMBA stock plummeted on Wednesday. X The Santa Clara, Calif.-based company late Tuesday said it lost an adjusted 15 cents a share on sales of $62.1 million in the quarter ended April 30. Analysts polled by FactSet had expected Ambarella to lose 20 cents a share on sales of $62 million. In the year-earlier period, Ambarella earned 44 cents a share on sales of $90.3 million. For the current quarter, Ambarella predicted sales of $60 million to $64 million. The midpoint...