Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2012

Computation of Diluted Net Loss Per Share does not Assume Issuance of Common Shares that have an Anti-dilutive Effect on Net Loss Per Share

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.

	Year Ended December 31,
	(in thousands, except share and per share amounts)
	2012			2011
Basic and diluted net loss per common share:
Net loss	$	(9,675	)	$	(10,915	)
Preferred stock dividends		(976	)		(1,568	)
Preferred stock accretion		(230	)		(230	)
Net loss applicable to common stockholders	$	(10,881	)	$	(12,713	)
Weighted average common shares outstanding—basic and diluted		15,131			11,986
Net loss per common share—basic and diluted	$	(0.72	)	$	(1.06	)

Dilutive Shares Which Could Exist Pursuant to Exercise of Outstanding Stock Instruments and Which were not Included in Calculation

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 during are as follows:

	December 31,
	2012		2011
	(Shares)		(Shares)
Warrants to purchase shares of common stock		7,424,241		6,673,405
Options to purchase shares of common stock		3,539,961		3,091,474
Shares of common stock issuable upon conversion preferred stock		2,627,110		2,627,110
		13,591,312		12,391,989