It has been about a month since the last earnings report for Westport Innovations (WPRT) . Shares have lost about 30.5% in that time frame, underperforming the S&P 500.Will the recent negative trend continue leading up to its next earnings release, or is Westport due for a breakout? Well, first let's take a quick look at the latest earnings report in order to get a better handle on the recent drivers for Westport Fuel Systems Inc. before we dive into how investors and analysts have reacted as of late.Westpo ...