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Certain Relationships and Related Transactions (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 18, 2017
Mar. 31, 2015
Related Party Transaction [Line Items]          
Gain on extinguishment of debt $ 1,031,000 $ 0 $ 0    
Interest expense, related party     229,000    
Debt instrument, fixed interest rate   12.00%      
Emmett Wood [Member]          
Related Party Transaction [Line Items]          
Compensation to related parties $ 570,000 $ 401,000 305,000    
Emmett Wood [Member] | Class A Common Stock [Member]          
Related Party Transaction [Line Items]          
Number of shares held by related party (in shares) 810,000 650,000      
Emmett Wood [Member] | Class B Common Stock [Member]          
Related Party Transaction [Line Items]          
Number of shares held by related party (in shares) 50,000        
Porter [Member]          
Related Party Transaction [Line Items]          
Common stock held by related parties 34.90%        
Gain on extinguishment of debt $ 1,000,000        
Proceeds from related party, debt 2,500,000        
Interest expense, related party $ 292,000 $ 300,000 $ 229,000    
Debt instrument, fixed interest rate 6.00%       12.00%
Debt instrument, last principal and interest payment date Jul. 25, 2022   Jul. 01, 2017    
Debt instrument, first interest payment due date     Aug. 20, 2015    
Porter [Member] | Series A-1 Redeemable Preferred Stock [Member]          
Related Party Transaction [Line Items]          
Number of senior redeemable preferred stock redeemed by the Company (in shares)       163  
Porter [Member] | Series A-2 Redeemable Preferred Stock [Member]          
Related Party Transaction [Line Items]          
Number of senior redeemable preferred stock redeemed by the Company (in shares)       228