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Stock-based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Estimated weighted average grant date fair value per share
Expected term	5 years 3 months 18 days	5 years 9 months 18 days
Expected volatility	108.00%	110.00%
Risk-free interest rate	0.15%	2.20%
Expected dividend yield	0.00%	0.00%
Weighted-average grant date fair value per share	$ 4.68	$ 10.95

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Name Accounting Standards Codification

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

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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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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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