Quarterly report pursuant to sections 13 or 15(d)

4. STOCK OPTION PLAN AND STOCK-BASED COMPENSATION (Details)

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4. STOCK OPTION PLAN AND STOCK-BASED COMPENSATION (Details)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock Option Plan And Stock-Based Compensation Details    
Risk-free interest rate, Minimum 0.55% 0.66%
Risk-free interest rate, Maximum 2.29% 1.00%
Expected dividend yield 0.00% 0.00%
Volatility factor, Minimum 85.60% 85.00%
Volatility factor, Maximum 98.40% 85.00%
Expected life of option, Minimum 2 years 6 months 4 years 6 months
Expected life of option, Maximum 7 years 6 years