NOTE 12 —Net Loss Per Share Attributable to Common Stockholders

Net loss per share attributable to common stockholders for the three months ended March 31, 2018 was determined by increasing Net loss for the three months then ended by the number of cumulative dividends, not yet declared, on the Company's previously outstanding convertible preferred stock. The following table sets forth the computation of the Company’s basic and diluted net loss per share attributable to common stockholders for the three months ended:

The potentially dilutive common shares that were excluded from the calculation of diluted net loss per share because their effect would have been antidilutive for the three months ended March 31, 2019 and 2018, respectively, are presented are as follows: