12. Net Loss Per Share

The following table presents the calculation of basic and diluted net loss per share of common stock for the periods indicated:


	Three Months Ended
	March 31,
(In thousands, except share and per share data)	2020		2019
Net loss attributable to common shareholders (basic and diluted)	$	(8,416)	$	(8,304)
Shares used to compute net loss per common share, basic and diluted		15,141,906		493,202
Net loss per share attributable to common shareholders, basic and diluted	$	(0.56)	$	(16.84)

Basic net loss per share is calculated by dividing net loss by the weighted-average number of common shares outstanding during the period. Diluted net loss per share is computed by dividing net loss by the weighted-average number of common shares and common share equivalents outstanding for the period. Common stock equivalents are only included when their effect is dilutive. The Company's potentially dilutive securities which include stock options, convertible preferred stock and common stock warrants have been excluded from the computation of diluted net loss per share as they would be anti-dilutive. For all periods presented, there is no difference in the number of shares used to compute basic and diluted shares outstanding due to the Company's net loss position.

The following outstanding common stock equivalents have been excluded from diluted net loss per common share for the three months ended March 31, 2020 and 2019 because their inclusion would be anti-dilutive.


	March 31,	March 31,
	2020	2019
	(unaudited)
Options issued and outstanding	4,508,021	40,625
Inducement options issued and outstanding	74	2,984
Restricted stock units issued and outstanding	5,613	5,613
Warrants issued and outstanding	17,622,930	71,821
Series A convertible preferred stock	473,565	33,149,556
Series B convertible preferred stock	4,423,250	—
Series B-2 convertible preferred stock	1,431,460	—
Convertible debt	—	10,849
Total	28,464,913	33,281,448