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Basis of Presentation and Summary of Significant Accounting Policies - Diluted Net Loss per Share (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Numerator:            
Net loss attributable to common stockholders         $ (16,706,668) $ (19,254,951)
Net loss used for basic and diluted loss per share         $ (16,706,668) $ (19,254,951)
Denominator:            
Weighted-average shares outstanding - basic (in shares)         5,973,906 2,330,180
Net loss per common share - basic and diluted (in dollars per share) $ (0.69) $ (0.76) $ (1.75) $ (2.40) $ (2.80) $ (8.26)