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CNB Loan - Additional Information (Details) - CNB Revolver [Member] - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Line of credit $ 3,000,000    
Debt instrument maturity date   Sep. 30, 2018  
Percentage of commitment fee on unused capacity 0.75%    
Line of credit facility amount outstanding     $ 0
30-day LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.00%