Quarterly report pursuant to Section 13 or 15(d)

4. Loss per share (Details)

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4. Loss per share (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator        
Net Loss $ (2,877,375) $ (2,680,338) $ (6,359,323) $ (5,213,883)
Undeclared dividends on Series A-1, A-2 and A-4 Convertible Preferred Stock (100,624) (100,624) (200,141) (201,247)
Conversion price reduction on Series B-2 Preferred Stock (see note 13) 0 0 (623,574) 0
Series B-2 warrant exchange (see note 13) 0 0 (347,191) 0
Dividends declared on Series B-2 Convertible Preferred Stock (139,874) (184,215) (323,701) (1,615,574)
Net loss attributable to common stockholders $ (3,117,873) $ (2,965,177) $ (7,853,930) $ (7,030,704)
Denominator        
Basic and diluted weighted average common shares outstanding 22,408,335 14,864,768 21,562,714 14,306,170
Loss per share        
Basic and diluted $ (0.14) $ (0.20) $ (0.36) $ (0.49)