Annual report pursuant to Section 13 and 15(d)

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

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6. STOCK OPTION PLAN AND STOCK-BASED COMPENSATION (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
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% 85.00%
Volatility factor, Maximum 91.00% 98.00%
Minimum [Member]    
Expected life of option 4 years 7 months 6 days 2 years 6 months
Maximum [Member]    
Expected life of option 10 years 7 years