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Debt - Narrative (Details)
12 Months Ended
Jun. 10, 2015
USD ($)
trading_day
$ / shares
Oct. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Nov. 17, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]          
Conversion rate 0.2        
Conversion price ($ per share) | $ / shares $ 5.00        
Repurchase price 100.00%        
Remaining discount amortization period 5 years        
Long-term debt     $ 124,055,000    
Stock price exceeds 130% of conversion price          
Debt Instrument [Line Items]          
Threshold of trading days | trading_day 20        
Threshold of consecutive trading days 30 days        
Threshold percentage of stock price trigger 130.00%        
Debt trading price below product of stock price and conversion rate          
Debt Instrument [Line Items]          
Threshold of consecutive trading days 5 days        
Threshold percentage of stock price trigger 98.00%        
Stock price exceeds 140% of conversion price          
Debt Instrument [Line Items]          
Threshold of trading days | trading_day 20        
Threshold of consecutive trading days 30 days        
Threshold percentage of stock price trigger 140.00%        
Repurchase price 100.00%        
Convertible Debt          
Debt Instrument [Line Items]          
Term of debt instrument 5 years        
Convertible debt, face amount $ 120,000,000   120,000,000    
Debt issuance costs $ 3,900,000        
Convertible debt, stated interest rate 5.50%        
Minimum principal needed to call debt 25.00%        
Redemption of principal 100.00%        
Company elected remedy in default 60 days        
Interest for Company elected remedy for default 0.50%        
Debt issuance cost allocated to equity component $ 1,300,000        
Debt issuance costs allocated to liability component $ 2,600,000        
Long-term debt     $ 82,461,000    
Effective interest rate     18.25%    
Convertible Debt | Debt trading price below product of stock price and conversion rate          
Debt Instrument [Line Items]          
Number of consecutive business days 5 days        
Revolving Credit Facility          
Debt Instrument [Line Items]          
Term of debt instrument   5 years      
Maximum borrowing capacity of revolving credit facility   $ 25,000,000   $ 48,000,000  
Outstanding borrowings under the credit facility     $ 0   $ (5,200,000)
Available borrowings     $ 17,400,000    
Revolving Credit Facility | Minimum          
Debt Instrument [Line Items]          
Margin on LIBOR rate     3.00%    
Revolving Credit Facility | Maximum          
Debt Instrument [Line Items]          
Margin on LIBOR rate     3.50%    
Letter of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity of revolving credit facility   $ 3,000,000      
Absa [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity of revolving credit facility     $ 1,500,000    
Outstanding borrowings under the credit facility     $ (1,500,000)    
Absa [Member] | Mortgage Bond          
Debt Instrument [Line Items]          
Term of debt instrument     10 years    
Margin on LIBOR rate     1.75%    
Long-term debt     $ 700,000    
Effective interest rate     8.00%    
Grindrod Bank [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity of revolving credit facility     $ 2,600,000    
Outstanding borrowings under the credit facility     $ (1,800,000)    
Prime Rate [Member] | Absa [Member]          
Debt Instrument [Line Items]          
Margin on LIBOR rate     0.10%    
Line of Credit Facility, Interest Rate at Period End     9.65%    
Prime Rate [Member] | Grindrod Bank [Member]          
Debt Instrument [Line Items]          
Margin on LIBOR rate     1.00%    
Line of Credit Facility, Interest Rate at Period End     10.75%