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Net Income (Loss) Per Common and Preferred Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Warrants outstanding     0
Convertible Preferred Shares [Member]      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Shares outstanding     0
Stock Options [Member]      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Anti-dilutive shares excluded from the calculation of loss per common share 2,214,110 2,128,751