NEW YORK ( TheStreet) -- Shares of Idenix Pharmaceuticals (Nasdaq: IDIX) were gapping down Friday morning with an open price 14% lower than Thursday's closing price. The stock closed at $7.76 Thursday and opened today's trading at $6.67. The average volume for Idenix has been 816,300 shares per day over the past 30 days. Idenix has a market cap of $719.2 million and is part of the health care sector and drugs industry. Shares are up 54% year to date as of the close of trading on Thursday. Idenix Pharmaceuticals, Inc., a biopharmaceutical company, engages in the discovery and development of drugs for the treatment of human viral diseases in the United States and Europe. Its primary research and development focus is on the treatment of patients with hepatitis C virus (HCV). TheStreet Ratings rates Idenix as a sell. The area that we feel has been the company's primary weakness has been its declining revenues. You can view the full Idenix Ratings Report. Get more investment ideas from our investment research center. Interested in other stocks that are gapping down? Get free SMS text alerts sent to you when the action happens by texting DOWN to 95370 or select from multiple alert options.