Net Loss per Share (Notes)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

Net Loss per Share

Basic net loss per share is calculated by dividing net loss by the weighted-average number of common shares outstanding during the period, without consideration of potential common shares. Diluted net loss per share is calculated by dividing net loss by the weighted-average number of common shares outstanding plus potential common shares. Convertible preferred stock, stock options and warrants are considered potential common shares and are included in the calculation of diluted net loss per share using the treasury stock method when their effect is dilutive. Potential common shares are excluded from the calculation of diluted net loss per share when their effect is anti-dilutive. As of March 31, 2020 and 2019, there were 11.6 million and 14.3 million potential common shares, respectively, that were excluded from the calculation of diluted net loss per share because their effect was anti-dilutive.