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Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]    
Operating loss carryforwards, expiration start year 2021  
Operating loss carryforwards, expiration end year 2035  
Federal alternative minimum tax credit carryforward $ 2,855,000 $ 2,855,000
Tax credit carryforwards, annual limitation on use amount 3,696,000  
Uncertain tax position 0 0
EJ Acquisition    
Income Taxes [Line Items]    
Tax credit carryforwards, annual limitation on use amount 341,000  
NBI Acquisition    
Income Taxes [Line Items]    
Tax credit carryforwards, annual limitation on use amount 2,040,000  
ColoEast Acquisition    
Income Taxes [Line Items]    
Tax credit carryforwards, annual limitation on use amount 1,906,000  
Federal    
Income Taxes [Line Items]    
Operating loss carryforwards, net 34,190,000 39,055,000
State    
Income Taxes [Line Items]    
Operating loss carryforwards, net $ 29,178,000 $ 34,500,000