Xenoport (Nasdaq: XNPT) is expected to report Q4 earnings around Feb. 15. Here's what Wall Street wants to see:

The 10-second takeaway
 Comparing the upcoming quarter to the prior-year quarter, average analyst estimates predict Xenoport's revenues will shrink -85.4% and EPS will remain in the red.

The average estimate for revenue is $.8 million. On the bottom line, the average EPS estimate is -$0.42.

Revenue details
 Last quarter, Xenoport booked revenue of $.4 million. GAAP reported sales were 0.0% lower than the prior-year quarter's $.4 million.

Source: S&P Capital IQ. Quarterly periods. Dollar amounts in millions. Non-GAAP figures may vary to maintain comparability with estimates.

EPS details
 Last quarter, EPS came in at -$0.41. GAAP EPS were -$0.41 for Q3 versus -$0.53 per share for the prior-year quarter.

Source: S&P Capital IQ. Quarterly periods. Non-GAAP figures may vary to maintain comparability with estimates.

Recent performance
 For the preceding quarter, gross margin was -2371.0%, 56,810 basis points better than the prior-year quarter. Operating margin was -4437.7%, 53,640 basis points better than the prior-year quarter. Net margin was -4420.3%, 53,830 basis points better than the prior-year quarter.

Looking ahead

The full year's average estimate for revenue is $21.9 million. The average EPS estimate is -$1.32.

Investor sentiment
 The stock has a two-star rating (out of five) at Motley Fool CAPS, with 173 members out of 209 rating the stock outperform, and 36 members rating it underperform. Among 49 CAPS All-Star picks (recommendations by the highest-ranked CAPS members), 33 give Xenoport a green thumbs-up, and 16 give it a red thumbs-down.

Of Wall Street recommendations tracked by S&P Capital IQ, the average opinion on Xenoport is outperform, with an average price target of $10.57.