10. Loss per Share

Basic and diluted net loss per share is presented in conformity with ASC Topic 260, Earnings per Share, (“ASC 260”) for all periods presented. In accordance with ASC 260, basic and diluted net loss per common share was determined by dividing net loss applicable to common stockholders by the weighted-average common shares outstanding during the period. In addition, the net loss attributable to common stockholders’ is adjusted for the preferred stock deemed dividends related accretion of beneficial conversion feature and other discount on this instrument for the periods in which the preferred stock is outstanding.

The following table sets forth the computation of basic and diluted net loss per share for the periods indicated:



	Three Months Ended
	March 31,
Basic and diluted net (loss) income per common share	2020		2019
Numerator:
Net loss	$	(4,226,617)	$	(1,983,711)
Preferred stock deemed dividend		—		(24,321)
Net loss attributable to common stockholders	$	(4,226,617)	$	(2,008,032)
Denominator:
Weighted average common shares outstanding		4,345,699		250,126
Net loss per share of common stock—basic and diluted	$	(0.97)	$	(8.03)

The following outstanding securities at March 31, 2020 and 2019 have been excluded from the computation of basic and diluted weighted shares outstanding, as they would have been anti-dilutive:



	Three Months Ended
	March 31,
	2020	2019
Common shares issuable upon conversion of Series A preferred stock	3,184	3,184
Common shares issuable upon conversion of Series C preferred stock	16,839	17,770
Stock options	41,271	9,013
Warrants – liability classified	107,998	107,998
Warrants – equity classified	2,428,568	3,991
Total	2,597,860	141,956

The liability and equity classified warrants disclosed above have been excluded from the computation of basic and diluted earnings per share because the exercise price of the warrants exceeds the average market price of our common stock for the period they were outstanding.