Equity-Based Compensation (Valuation Assumptions) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Method used	Black-Scholes-Merton
Expected dividend yield (percent)	0.00%	0.00%
Minimum [Member]
Risk-free interest rate (percent)	0.14%	0.68%
Expected term	1 year	5 years
Expected volatility (percent)	89.727%	108.76%
Maximum [Member]
Risk-free interest rate (percent)	1.01%	0.86%
Expected term	5 years	5 years
Expected volatility (percent)	118.222%	108.96%
Weighted Average [Member]
Weighted average grant date fair value per option (usd per share)	$ 0.12	$ 0.21
Weighted average grant date fair value, options issued (shares)	2,520,000	1,439,000