Shares of Upland Software Inc. (NASDAQ: UPLD) climbed 18.6% Monday after the cloud-based enterprise work management software specialist made a small acquisition and increased its full-year 2017 guidance.First, Upland announced it has acquired cloud-based knowledge management system company RightAnswers, Inc. for $17.2 million in cash, a $2.5 million cash holdback payable in one year, and potential future earn-out payments tied to performance-based goals.