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Earnings Per Share of Common Stock - Schedule of Weighted Average Number of Common Shares (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic and diluted net income per common share outstanding:        
Basic 9,266,962 8,106,499 8,499,967 8,120,091
Incremental shares for assumed exercise of options 7,860 10,652 7,757 11,309
Diluted 9,274,822 8,117,151 8,507,724 8,131,400