NET LOSS PER SHARE

12 Months Ended

Dec. 31, 2020

The following is a reconciliation of basic and diluted net loss per share attributable to common stockholders:


	Year Ended December 31,
	2020		2019		2018
Net loss from continuing operations	$	(32,944)	$	(12,685)	$	(12,025)
Net loss from discontinued operations	—		(1,046)		—
Net loss attributable to common stockholders - basic and diluted	$	(32,944)	$	(13,731)	$	(12,025)
Weighted average number of shares - basic and diluted	18,056,828		14,624,194		12,567,387
Net loss from continuing operations per share attributable to common stockholders - basic and diluted	$	(1.82)	$	(0.87)	$	(0.96)
Net loss from discontinued operations per share attributable to common stockholders - basic and diluted	—		(0.07)		—
Net loss per share attributable to common stockholders - basic and diluted	$	(1.82)	$	(0.94)	$	(0.96)

Our basic and diluted net loss per share is computed using the two-class method. The two-class method is an earnings allocation that determines net income per share for each class of common stock and participating securities according to their participation rights in dividends and undistributed earnings or losses. Non-vested restricted stock that includes non-forfeitable rights to dividends are considered participating securities.

Because we have incurred a net loss for all periods presented, diluted net loss per common share is the same as basic net loss per common share. The following contingently issuable and convertible equity shares were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for all periods presented:


	Year Ended December 31,
	2020	2019	2018


Restricted stock	436,730	318,002	177,293
Stock options	12,802	70,628	112,094
Warrants	—	404	6,790
	449,532	389,034	296,177