Net Loss Per Share	3 Months Ended
Mar. 31, 2013
Net Loss Per Share	7. Net Loss Per Share Basic net loss per share is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common shares outstanding during the period and dilutive potential common shares using the treasury-stock method. For purposes of this calculation, common stock subject to repurchase by us, outstanding options and warrants are considered to be dilutive potential common shares and are only included in the calculation of diluted net loss per share when their effect is dilutive. Outstanding warrants, stock options and stock awards to purchase approximately 30,800,000 and 39,300,000 shares of common stock as of March 31, 2013 and 2012, respectively, were excluded from the calculation of diluted net loss per share for the quarters ended March 31, 2013 and 2012, because the effect of their inclusion would have been anti-dilutive.

Net Loss Per Share

3 Months Ended

Mar. 31, 2013

7. Net Loss Per Share

Basic net loss per share is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common shares outstanding during the period and dilutive potential common shares using the treasury-stock method. For purposes of this calculation, common stock subject to repurchase by us, outstanding options and warrants are considered to be dilutive potential common shares and are only included in the calculation of diluted net loss per share when their effect is dilutive. Outstanding warrants, stock options and stock awards to purchase approximately 30,800,000 and 39,300,000 shares of common stock as of March 31, 2013 and 2012, respectively, were excluded from the calculation of diluted net loss per share for the quarters ended March 31, 2013 and 2012, because the effect of their inclusion would have been anti-dilutive.

- Definition

The entire disclosure for earnings per share.

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