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6. STOCK-BASED COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted-Average Assumptions of Stock Based Compensation

The following weighted-average assumptions were used for grants issued during the three and six months ended June 30, 2013 and 2012 under the ASC No. 718 requirements.

 

    Three months ended June 30,   Six months ended June 30,
    2013   2012   2013   2012
Weighted-average risk-free rate   0.55%   0.55%   0.56%   0.67%
Weighted-average volatility   79.47%   96.21%   79.80%   96.10%
Dividend yield   0.00%   0.00%   0.00%   0.00%
Expected life   4.92 years   5.38 years   4.82 years   6.11 years