10. Net Loss Per Share

        Basic net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period.

        Diluted net loss per share is computed by giving effect to all potential shares of common stock, including stock options, convertible preferred stock warrants and redeemable convertible preferred stock, to the extent dilutive. Basic and diluted net loss per share was the same for each year presented as the inclusion of all potential common shares outstanding would have been anti-dilutive.

        The following table sets forth the computation of historical basic and diluted net loss per share.

        Net loss is increased by the cumulative dividends payable upon conversion or liquidation of redeemable convertible preferred shares earned each year to arrive at net loss attributable to common stockholders.

        The reversal of dividends on redeemable convertible preferred stock recorded on the statement of redeemable convertible preferred stock and shareholders' deficit for the fiscal year ended January 31, 2011 reflects the reversal of previously recorded accretion of the redemption value of the redeemable convertible preferred stock in connection with the issuance of Series G and the reversal of previously recorded incremental dividends recorded for the portion of the cumulative dividends for which the Company did not have sufficient authorized shares of common stock as of January 31, 2010 while the amount of dividends reflected in the net loss per share calculation above represents the total increase in cumulative dividends during the fiscal year ended January 31, 2011.

        Net loss was increased by the cumulative dividends payable upon conversion or liquidation of redeemable convertible preferred shares earned during the period to arrive at net loss attributable to common stockholders for the fiscal year ended January 31, 2011. For the fiscal year ended January 31, 2012 dividends were accrued up through the conversion at the close of the IPO.

        The following potential common shares outstanding were excluded from the computation of diluted net loss per share because including them would have been anti-dilutive: