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Net Loss Per Share
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Net Loss Per Share

6. 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 giving effect to all potentially dilutive common shares using the treasury-stock method. For purposes of this calculation, common stock subject to repurchase by us, outstanding options, stock awards, warrants and Series B Convertible Preferred Stock are considered to be potentially dilutive common shares and are only included in the calculation of diluted net loss per share when their effect is dilutive. Outstanding warrants, stock options, Series B Convertible Preferred Stock and stock awards totaling approximately 75,000,000 and 31,100,000 shares of common stock as of September 30, 2014 and 2013, respectively, were excluded from the calculation of diluted net loss per share for the three and nine months ended September 30, 2014 and 2013, because the effect of their inclusion would have been anti-dilutive. For periods in which the Company has a net loss and no instruments are determined to be dilutive, such as the nine months ended September 30, 2014, basic and diluted loss per share are the same.