Quarterly report pursuant to Section 13 or 15(d)

4. Loss per share (Details 1)

v3.7.0.1
4. Loss per share (Details 1) - shares
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Antidilutive securities excluded from the calculation of diluted earnings per common share 6,883,655 6,760,314
Warrants [Member]    
Antidilutive securities excluded from the calculation of diluted earnings per common share 2,657,900 2,971,685
Convertible preferred stock [Member]    
Antidilutive securities excluded from the calculation of diluted earnings per common share 2,065,230 2,629,645
Stock options [Member]    
Antidilutive securities excluded from the calculation of diluted earnings per common share 2,160,525 1,158,984