What happened

NxStage Medical (NASDAQ:NXTM) closed down 10.8% on no obvious news.

So what

The kidney-dialysis expert was trading at all-time highs yesterday, so it appears investors may be getting a little jittery with NxStage Medical scheduled to report first-quarter earnings next Tuesday. Even with today's drop, shares in the company are still up more than 60% over the last year.

Management expects NxStage Medical's business to pick up as the year progresses. Revenue guidance for the year is in the range of $400 million to $405 million, but management expects less than a quarter of that -- between $95 million and $97 million -- will hit the books in the first quarter. For earnings, a loss of $1 million to $3 million is expected in the first quarter, but management anticipates the rest of the year to wipe that out, with positive earnings for 2017 in its entirety.

Patient's arm hooked up to dialysis

Image source: Getty Images.

Now what

Long-term investors can ignore random movements -- in both directions -- that don't seem to have any reason behind them.

Beyond earnings next week, investors should be on the lookout for an approval by the U.S. Food and Drug Administration for NxStage's next-generation hemodialysis system, System One. In March, the company gained CE Marking approval for the system, allowing it to be sold in the EU.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.