$ROKU DA Davidson Reiterates Buy, $185 Target On Roku As Firm Notes 'We recommend investors "kumulate" shares on weakness'; Firm Cites 3 Reasons For Initial Decline: '1) lower-than-anticipated profitability guidance ($5M at the midpoint), 2) expenses related to its data acquisition and 3) overly optimistic initial consensus estimates for 4Q19 (that were above the high end of management’s guidance range due to its strong beat-and-raise track record)'