Net loss per share Net loss per share

3 Months Ended

Mar. 31, 2013

Basic net loss per share is computed by dividing the net loss for the year by the weighted average number of common shares outstanding during the year. Diluted loss per share is calculated in accordance with the treasury stock method and reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted to common stock. Since the effect of the assumed exercise of common stock options and other convertible securities was anti-dilutive for all periods presented, basic and diluted loss per share are the same.

The following table summarizes potential common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect:



	As of March 31,
Common Stock Equivalents	2013	2012
Options to purchase common stock	18,493,523	16,495,527
Warrants to purchase common stock	35,227,529	21,743,844
Convertible preferred stock	38,233	38,233
Total	53,759,285	38,277,604

- Definition

The entire disclosure for earnings per share.

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