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Summary of Significant Accounting Policies - Net Loss Per Share (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Numerator: Net loss attributable to common shareholders $ (4,179,100) $ (4,792,237)
Net loss used for diluted loss per share $ (4,179,100) $ (4,792,237)
Denominator for basic and diluted net loss per share:    
Weighted-average shares used to compute basic loss per share (in shares) 4,086,561 768,951
Weighted-average shares used to compute diluted net loss per share (in shares) 4,086,561 768,951
Net loss per share attributable to common stockholders:    
Net loss per common share - basic (in USD per share) $ (1.02) $ (6.23)
Net loss per common share - diluted (in USD per share) $ (1.02) $ (6.23)