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Stock-Based Compensation (Details 5) (USD $)	12 Months Ended		0 Months Ended	1 Months Ended	0 Months Ended	1 Months Ended
Stock-Based Compensation (Details 5) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Apr. 06, 2011 Warrant [Member] Commitment Date [Member]	Jul. 28, 2011 Warrant [Member] Commitment Date [Member]	Apr. 06, 2011 Warrant [Member] Remeasurement Date [Member]	Jul. 28, 2011 Warrant [Member] Remeasurement Date [Member]
Closing stock price			$ 1.39	$ 2.08	$ 2.08	$ 0.84
Expected dividend rate	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Expected stock price volatility	110.00%	174.00%	117.10%	112.10%	104.60%	105.60%
Risk free interest rate	0.26%	0.71%	0.28%	0.29%	0.29%	0.21%
Expected life (years)	2 years	5 years	1 year 29 days	1 year 29 days	10 months 6 days	1 year 15 days

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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