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
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Antidilutive securities excluded from the calculation of diluted earnings per common share 6,911,877 6,756,640
Warrants [Member]    
Antidilutive securities excluded from the calculation of diluted earnings per common share 2,697,679 3,005,337
Convertible preferred stock [Member]    
Antidilutive securities excluded from the calculation of diluted earnings per common share 2,063,125 2,627,795
Stock options [Member]    
Antidilutive securities excluded from the calculation of diluted earnings per common share 2,151,073 1,123,508