Basic net loss per share is calculated by dividing the net loss attributable to common shareholders by the weighted-average number of common shares outstanding during the period, without consideration for common shares equivalents. Diluted net loss per share is computed by dividing the net loss attributable to common shareholders by the weighted-average number of common share equivalents outstanding for the period determined using the treasury-stock method. For purposes of this calculation, stock options and warrants are considered to be common share equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive.

The following table presents the computation of basic and diluted net loss per share (in thousands, except per share amounts):

The following dilutive securities have been excluded from the computation of diluted weighted-average shares outstanding as of the year ended December 31, 2014, 2013 and 2012 as the Company recorded a net loss in all periods and, therefore, they would be anti-dilutive (in thousands):