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4. STOCK-BASED COMPENSATION (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Summary of weighted-average assumptions used for grants issued
Weighted-average risk-free rate	1.19%	1.26%	1.18%	1.25%
Weighted-average volatility	83.01%	81.42%	82.40%	81.62%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected life	4 years 2 months 12 days	4 years 10 months 20 days	4 years 3 months 14 days	4 years 9 months

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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.

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-Publisher FASB



-Name Accounting Standards Codification



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- Definition

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

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-Publisher FASB



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Weighted average expected volatility rate of share-based compensation awards.

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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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