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Net Loss Per Common Share - Reconciliation of Net Loss Per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator:        
Net loss $ (2,415,332) $ (2,932,722) $ (4,900,236) $ (5,706,903)
Denominator:        
Basic and diluted weighted average shares outstanding (in shares) 53,834,285 38,614,940 51,859,818 37,942,856
Net loss per common share:        
Net loss per common share – basic (in dollars per share) $ (0.04) $ (0.08) $ (0.09) $ (0.15)
Net loss per common share – diluted (in dollars per share) $ (0.04) $ (0.08) $ (0.09) $ (0.15)