Net Loss per Common Share Applicable to Common Stockholders	12 Months Ended
Dec. 31, 2019
Net Loss per Common Share Applicable to Common Stockholders
Net Loss per Common Share Applicable to Common Stockholders	Note 17. Net Loss per Common Share Applicable to Common Stockholders Net loss applicable to common stockholders represents net loss adjusted for deemed dividends related to the December 2019 Private Placement, as more fully described in Note 7. Basic and diluted net loss per common share applicable to common stockholders is calculated by dividing net loss applicable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, without consideration of common stock equivalents. The Company’s potentially dilutive securities, which include outstanding stock option awards, unvested restricted stock units, common stock warrants, convertible preferred stock and securities underlying the Future Tranche Rights (see Note 7), are considered to be common stock equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive. For the years ended December 31, 2019, 2018 and 2017, diluted net loss per common share applicable to common stockholders was the same as basic net loss per common share applicable to common stockholders as the effects of the Company’s potential common stock equivalents are antidilutive. Total antidilutive securities that were excluded from the calculation of diluted net loss per share applicable to common stockholders, due to their anti-dilutive effect, were 61,289,079, 6,075,339, and 8,145,188 as of December 31, 2019, 2018 and 2017, respectively. Such antidilutive securities consisted of stock options, unvested restricted stock units, convertible preferred stock, warrants and securities underlying Future Tranche Rights as December 31, 2019, and consisted of stock options, convertible preferred stock and warrants as of December 31, 2018 and 2017.

Note 17. Net Loss per Common Share Applicable to Common Stockholders

Net loss applicable to common stockholders represents net loss adjusted for deemed dividends related to the December 2019 Private Placement, as more fully described in Note 7. Basic and diluted net loss per common share applicable to common stockholders is calculated by dividing net loss applicable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, without consideration of common stock equivalents. The Company’s potentially dilutive securities, which include outstanding stock option awards, unvested restricted stock units, common stock warrants, convertible preferred stock and securities underlying the Future Tranche Rights (see Note 7), are considered to be common stock equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive. For the years ended December 31, 2019, 2018 and 2017, diluted net loss per common share applicable to common stockholders was the same as basic net loss per common share applicable to common stockholders as the effects of the Company’s potential common stock equivalents are antidilutive.

Total antidilutive securities that were excluded from the calculation of diluted net loss per share applicable to common stockholders, due to their anti-dilutive effect, were 61,289,079, 6,075,339, and 8,145,188 as of December 31, 2019, 2018 and 2017, respectively. Such antidilutive securities consisted of stock options, unvested restricted stock units, convertible preferred stock, warrants and securities underlying Future Tranche Rights as December 31, 2019, and consisted of stock options, convertible preferred stock and warrants as of December 31, 2018 and 2017.