Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The fair value of the stock options granted during the three and nine month periods ended September 30, 2012 and 2011 was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Expected life (years)	5.5		5.4		5.5		5.4
Expected volatility	92.4	%	93.7	%	92.4	%	93.4	%
Expected dividend yield	—		—		—		—
Risk-free interest rate	0.7	%	1.5	%	0.7	%	1.6	%
Weighted average fair value of options
granted during the period	$0.47		$0.78		$0.47		$0.74

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes stock option activity for the nine month period ended September 30, 2012:



	Number of Shares		Weighted Average Exercise Price Per Share	Weighted Average remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding balance at December 31, 2011	5,988,500		$1.68
Granted	2,125,000		0.65
Exercised	—		—
Expired	(769,650	)	3.23
Forfeited	(328,750	)	0.90
Outstanding balance at September 30, 2012	7,015,100		$1.24	7.4	$152
Options exercisable at September 30, 2012	2,890,000		$2.03	5.2	$59