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Debt - Main Street Payoff Letter and Redemption Agreement (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Common Stock, shares outstanding (in shares)   44,510,000 36,455,000
Extinguishment of debt $ 11,562    
Payment of debt extinguishment or debt repayment with cash on hand 350    
Proceeds from issuance of debt 2,200    
Repurchase of common stock     $ 13
Principal payments under borrowing arrangements   $ 605 $ 400
Term Loan | Main Street Capital Corporation      
Debt Instrument [Line Items]      
Senior notes $ 9,000    
Stated interest rate percentage 12.00%    
Common shares owned stockholder percentage 21.00%    
Extinguishment of debt $ 9,000    
Payment for debt extinguishment or prepayment cost 2,550    
Principal payments under borrowing arrangements $ 237    
Main Street Capital Corporation      
Debt Instrument [Line Items]      
Common Stock, shares outstanding (in shares) 7,711,517    
Main Street Capital Corporation      
Debt Instrument [Line Items]      
Repurchase of common stock, Shares (in shares) 7,711,517    
Repurchase of common stock $ 2,313    
Treasury stock acquired (in dollars per share) $ 0.30