Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of XenoPort (NASDAQ: XNPT), a biopharmaceutical company focused on treating neurological disorders, shed as much as 13% following the release of its fourth-quarter earnings results.

So what: For the quarter, XenoPort reported $0.5 million in total revenue compared to $5.1 million in the year-ago period. However, due to a non-cash gain resulting from resolved litigation with GlaxoSmithKline (GSK -0.51%) -- prior to this quarter, Glaxo and XenoPort had a collaboration agreement for the sale of Horizant extended-release tablets -- XenoPort turned in a $3 million profit, or $0.07 per share.

Now what: I believe a lot of today's pessimism revolves around investor concern over whether XenoPort can effectively commercialize Horizant without a large collaborative partner. Given that sales of the drug totaled just $2.1 million in the fourth quarter, according to Glaxo's recorded figures, I can't exactly say that things look all too promising. Furthermore, XenoPort announced that it plans to use $100 million to $110 million in cash just in 2013, and it only ended the year with $139 million in cash and cash equivalents. I sense a big dilutive offering potentially on the way either next year or in 2014.

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