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Significant Accounting Policies - Net Loss Per Common Share (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net (Loss) Income Per Common Share    
Net loss $ (14,083,897) $ (11,512,844)
Basic and diluted net loss per common share (in dollars per share) $ (0.33) $ (0.33)
Basic and diluted weighted average common shares outstanding 43,166,967 35,156,090
Warrants    
Anti-dilutive securities excluded    
Anti-dilutive securities   553,868
Stock options and restricted stock units    
Anti-dilutive securities excluded    
Anti-dilutive securities 4,836,170 3,952,792