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
Mar. 31, 2017
Mar. 31, 2016
Numerator    
Net Loss $ (3,481,948) $ (2,533,545)
Undeclared dividends on Series A-1, A-2 and A-4 Convertible Preferred Stock (99,518) (100,623)
Conversion price reduction on Series B-2 Preferred Stock (see note 13) (623,574) 0
Series B-2 warrant exchange (see note 13) (347,190) 0
Dividends declared on Series B-2 Convertible Preferred Stock (183,827) (1,431,359)
Net loss attributable to common stockholders $ (4,736,057) $ (4,065,527)
Denominator    
Basic and diluted weighted average common shares outstanding 20,707,699 13,741,366
Loss per share    
Basic and diluted $ (0.23) $ (0.30)