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Net Loss Per Share	6 Months Ended
Net Loss Per Share	Jun. 30, 2015
Text Block [Abstract]
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 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, Series B Convertible Preferred Stock, and warrants 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. Stock options, Series B Convertible Preferred Stock, warrants and stock awards totaling approximately 4,660,000 and 7,630,000 shares of common stock as of June 30, 2015 and 2014, respectively, were excluded from the calculation of diluted net loss per share for the three months ended June 30, 2015 and 2014, 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 three months ended June 30, 2015 and 2014, basic and diluted loss per share are the same.