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Significant Accounting Policies - Net Loss Per Common Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock options and restricted stock units        
Anti-dilutive securities excluded        
Anti-dilutive securities 5,073,149 3,981,055 5,073,149 3,981,055