4. Net Loss per Share

Basic net loss per share is computed by dividing the net loss 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 shares of common stock underlying stock options and restricted stock units, to the extent dilutive. Basic and diluted net loss per share were the same for the three and nine months ended September 30, 2017 and 2016 respectively, as the inclusion of all underlying common shares would have been anti-dilutive.