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Related Party Transactions - Narrative (Details) - USD ($)
Jul. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]      
Common stock, including accrued interest   $ 5,000 $ 5,000
Common Stock, shares issued (in shares)   51,137,000 45,161,000
Long-term debt   $ 0 $ 1,563,000
Common Stock, shares outstanding (in shares)   49,812,000 44,510,000
Main Street Capital Corporation      
Related Party Transaction [Line Items]      
Repurchase of common stock, shares (in shares) 7,711,517    
Main Street Capital Corporation | Term Loan      
Related Party Transaction [Line Items]      
Common shares owned stockholder percentage 21.00%    
SRS Note | Promissory Note | President and CEO      
Related Party Transaction [Line Items]      
Note payable, individual ownership percentage 27.30%    
Common stock, including accrued interest $ 699,528    
Common Stock, shares issued (in shares) 1,806,087    
Conversion price (in dollars per share) $ 0.387    
Long-term debt $ 0    
Main Street Capital Corporation      
Related Party Transaction [Line Items]      
Common Stock, shares outstanding (in shares) 7,711,517    
Main Street Capital Corporation | Main Street Capital Corporation      
Related Party Transaction [Line Items]      
Repurchase of common stock, shares (in shares) 7,711,517    
Main Street Capital Corporation | Main Street Capital Corporation | Term Loan      
Related Party Transaction [Line Items]      
Common shares owned stockholder percentage 21.00%