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Stockholders Equity (Details)	12 Months Ended
Stockholders Equity (Details)	Dec. 31, 2012 Date 11-16-2012 [Member]	Dec. 31, 2012 Date 8-14-2012 [Member]	Dec. 31, 2011 Date 5-15-2012 [Member]	Dec. 31, 2011 Date 11-15-2011 [Member]
Risk-free interest rate	0.62%	0.75%	0.74%	0.93%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected life (years)	5 years	5 years	5 years	5 years
Volatility	9.13%	111.80%	122.70%	1.30%

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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