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Net Income per Common Share - Calculation of diluted weighted average common shares outstanding (Details) - shares
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Series A preferred stock    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 16,542,243
Common stock warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 3,105,279