NET INCOME (LOSS) PER COMMON SHARE

3 Months Ended

Mar. 31, 2012

NET INCOME (LOSS) PER COMMON SHARE [Abstract]

NET INCOME (LOSS) PER COMMON SHARE

14. NET LOSS PER COMMON SHARE

Basic net loss per common share is computed by dividing the net loss by the weighted-average number of shares of common stock outstanding for the period, excluding unvested restricted stock awards.  Diluted net loss per common share reflects the potential dilution from the exercise or conversion of securities into common stock, the effect of unvested restricted stock awards and restricted stock units, and the impact of shares to be issued under the ESPP.

For the three months ended March 31, 2012 and 2011, the effects of the exercise of the combined outstanding stock options and warrants and unvested restricted stock awards and restricted stock units of 1,575,513 and 2,483,015, respectively, and the impact of shares to be issued under the ESPP, which was minor, were excluded from the calculation of diluted EPS as the impact would have been antidilutive.