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10. Stockholders Equity (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Summary of weighted-average assumptions used for grants issued
Weighted-average risk-free rate	0.53%	1.54%
Weighted-average volatility	95.21%	97.70%
Dividend yield	0.00%	0.00%
Expected life	5 years 8 months 15 days	5 years 2 months 19 days

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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.

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

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The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term.

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