6.	Loss Per Share

Basic net loss per common share is computed by dividing the net loss available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted net loss per common share is computed by dividing the net loss available to common stockholders by the weighted average number of common shares and other potential common shares then outstanding. Potential common shares consist of common shares issuable upon the assumed exercise of in-the-money stock options and warrants and potential common shares related to the conversion of the preferred stock. The computation of diluted net loss per share does not assume the issuance of common shares that have an anti-dilutive effect on net loss per share.


	Three Months Ended March 31,
	2014			2013
	(in thousands, except share and per share amounts)
Basic and diluted net loss per common share:
Net loss applicable to common stockholders	$	(5,408	)	$	(3,472	)
Weighted average common shares outstanding – basic and diluted		20,270			16,079
Net loss per common share – basic and diluted	$	(0.27	)	$	(0.22	)

Dilutive shares which could exist pursuant to the exercise of outstanding stock instruments and which were not included in the calculation because their affect would have been anti-dilutive are as follows:


	March 31, 2014 (shares)		March 31, 2013 (shares)
Warrants to purchase shares of common stock		5,505,579		7,429,241
Options to purchase shares of common stock		3,365,198		3,656,217
Shares of common stock issuable upon conversion of preferred stock		2,550,437		2,618,772

		11,421,214		13,704,230