Quarterly report pursuant to Section 13 or 15(d)

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

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5. STOCK OPTION PLAN AND STOCK-BASED COMPENSATION (Details)
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Stock Option Plan And Stock-based Compensation Details    
Risk-free interest rate, Minimum 1.30% 0.50%
Risk-free interest rate, Maximum 1.90% 2.30%
Expected dividend yield 0.00% 0.00%
Volatility factor, Minimum 79.00% 86.00%
Volatility factor, Maximum 91.00% 98.00%
Expected life of option, Minimum 4 years 7 months 6 days 2 years 6 months
Expected life of option, Maximum 10 years 7 years