Share-Based Compensation Stock Option Valuation Assumptions (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected life (years)	5 years 4 months 24 days	5 years 6 months	5 years 4 months 24 days	5 years 6 months
Expected volatility	89.60%	92.40%	89.60%	92.40%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Risk-free interest rate	1.50%	0.70%	1.50%	0.70%
Weighted average fair value of options granted during the period	$ 0.34	$ 0.47	$ 0.34	$ 0.47