Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

The fair value of the stock options granted during the three month period ended March 31, 2014 was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions:



	Three Months Ended March 31,
	2014
Expected life (years)	5.24
Expected volatility	85.0%
Expected dividend yield	—%
Risk-free interest rate	1.8%
Weighted average fair value of options granted during the period	$0.38

Schedule of Stock Option Activity

The following table summarizes stock option activity for the three month period ended March 31, 2014:



	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, 2013	4,150,550		$	0.75
Granted	462,600		0.56
Exercised	(37,500	)	0.45
Expired	(505,550	)	1.20
Forfeited	(83,500	)	0.57
Outstanding balance at March 31, 2014	3,986,600		0.68		8.5	$222
Options exercisable at March 31, 2014	1,388,700		$	0.99	6.8	$51