Net Income (Loss) Per Share

6 Months Ended

Jun. 30, 2011

Net Income (Loss) Per Share [Abstract]

Earnings Per Share [Text Block]

Net Income (Loss) Per Share

Basic net income (loss) per share attributable to MRV is computed using the weighted average number of shares of Common Stock outstanding during the period. Diluted net income (loss) per share attributable to MRV is computed using the weighted average number of shares of Common Stock outstanding and dilutive potential shares of Common Stock from stock options outstanding during the period. Diluted shares outstanding include the dilutive effect of in-the-money options, which is calculated based on the average share price for each period using the treasury stock method.

Outstanding stock options to purchase 8.4 million shares were excluded from the computation of dilutive shares for the three months ended June 30, 2011 because such stock options were anti-dilutive since they were not in-the-money. For the three months ended June 30, 2010, 9.4 million shares were excluded from the calculation of diluted net loss per share because such stock options were anti-dilutive. For the six months endedJune 30, 2011 and 2010, 7.5 million and 9.7 million potentially dilutive shares were excluded from the calculation of diluted net earnings per share, respectively, because such shares were anti-dilutive since they were not in-the-money. Shares purchased into treasury shares are excluded from any subsequent information concerning the number of shares outstanding.