Have you been paying attention to shares of HealthStream (HSTM) ? Shares have been on the move with the stock up 9.3% over the past month. The stock hit a new 52-week high of $31.7 in the previous session. HealthStream has gained 16.1% since the start of the year compared to the 29.4% move for the Zacks Computer and Technology sector and the 24.8% return for the Zacks Internet - Services industry.What's Driving the Outperformance?The stock has a great record of positive earnings surprises, as it hasn't miss ...