NET LOSS PER SHARE

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



	Year Ended December 31,
	2017			2016			2015
Net loss	$	(8,932	)	$	(6,572	)	$	(7,891	)
Accretion of cumulative dividends of redeemable preferred stock to redemption value	(4,563		)	(5,876		)	(4,797		)
Forfeiture of 50% of Series B Preferred Stock accumulated dividends	5,965			—			—
Series A Preferred Stock preference payment in common stock	(16,000		)	—			$	—
Net loss attributable to common stockholders - basic and diluted	$	(23,530	)	$	(12,448	)	$	(12,688	)
Weighted average number of shares - basic and diluted	4,017,330			1,744,356			1,744,356
Net loss per share attributable to common stockholders - basic and diluted⁽¹⁾	$	(5.86	)	$	(7.14	)	$	(7.27	)


⁽¹⁾	The effect of discontinued operations on loss per share has been excluded for 2015 as it is not material.

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. Series A and B preferred stock include rights to participate in dividends and distributions to common stockholders on an if-converted basis, and accordingly are also considered participating securities. During periods of undistributed losses however, no effect is given to our participating securities since they are not contractually obligated to share in the losses.

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 (shares for the redeemable convertible preferred shares were determined based on the applicable conversation ratio of 1:1:



	Year Ended December 31,
	2017	2016	2015
Redeemable convertible preferred stock - Series A	—	670,000	670,000
Redeemable convertible preferred stock - Series B	—	2,979,475	2,979,475
Restricted stock	548,005	677,241	593,653
Stock options	176,959	248,201	248,871
Warrants	44,101	44,101	44,101
	769,065	4,619,018	4,536,100