Quarterly report pursuant to Section 13 or 15(d)

Assumptions used to value the options granted and warrants issued using the Black-Scholes option pricing model (Details)

v3.5.0.2
Assumptions used to value the options granted and warrants issued using the Black-Scholes option pricing model (Details)
Jun. 30, 2016
$ / shares
Dec. 31, 2015
$ / shares
Series E and G    
Stock price volatility 111.60%  
Risk-free rate of return 4.26%  
Annual dividend yield 0.00%  
Expected life (in years) 0.5  
Series F and H    
Stock price volatility 111.60%  
Risk-free rate of return 4.26%  
Annual dividend yield 0.00%  
Expected life (in years) 3.0  
Mentor warrants in years 21.96 22.4
Weighted average outstanding warrant exercise price per share $ 1.9 $ 1.88