Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

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

Schedule of Valuation Assumptions

The fair value of the stock options granted during the three and six month periods ended June 30, 2014 was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions:

	Three Months Ended June 30,	Six Months Ended June 30,
	2014	2014
Expected life (years)	5.26	5.25
Expected volatility	78.5%	83.1%
Expected dividend yield	—%	—%
Risk-free interest rate	1.8%	1.8%
Weighted average fair value of options granted during the period	$0.40	$0.39

Schedule of Stock Option Activity

The following table summarizes stock option activity for the six month period endedJune 30, 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	643,700		0.58
Exercised	(54,000	)	0.51
Expired	(536,300	)	1.19
Forfeited	(173,950	)	0.37
Outstanding balance at June 30, 2014	4,030,000		0.67		8.34	$809
Options exercisable at June 30, 2014	1,341,450		$	0.99	6.58	$174