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Related Party Transactions - Narrative (Details) - USD ($)
12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Related Party Transaction [Line Items]        
Long-term debt   $ 1,563,000 $ 10,660,000 $ 11,500,000
Common stock, including accrued interest   $ 5,000 $ 4,000  
Common Stock, shares issued (in shares)   45,161,000 36,659,000  
Common Stock, shares outstanding (in shares)   44,510,000 36,455,000  
Main Street Capital Corporation        
Related Party Transaction [Line Items]        
Repurchase of common stock, Shares (in shares) 7,711,517      
Nectar | Director        
Related Party Transaction [Line Items]        
Expenses from transactions with related party   $ 0 $ 11,000  
Outstanding payables due to related party   $ 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      
SRS Note | Promissory Note        
Related Party Transaction [Line Items]        
Long-term debt $ 0      
SRS Note | Promissory Note | President and CEO        
Related Party Transaction [Line Items]        
Note payable, individual ownership percentage 27.30%     27.30%
Common stock, including accrued interest $ 699,528      
Common Stock, shares issued (in shares) 1,806,087      
Debt Instrument, Convertible, Conversion Price $ 0.387      
Main Street Capital Corporation | Term Loan        
Related Party Transaction [Line Items]        
Common shares owned stockholder percentage 21.00%      
Main Street Capital Corporation | Term Loan | Main Street Capital Corporation        
Related Party Transaction [Line Items]        
Common shares owned stockholder percentage       21.00%