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Credit Facility and Convertible Debentures - Credit Arrangements Narrative (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Debt Instrument [Line Items]          
Proceeds from credit facility     $ 50,000,000 $ 0  
Revolving Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 75,000,000        
Long-term line of credit outstanding         $ 50,000,000
Proceeds from credit facility $ 44,300,000        
Debt instrument, term (in years) 3 years        
Interest payable amount outstanding threshold $ 50,000,000        
Commitment fee percentage 0.75%        
Liquidity threshold $ 20,000,000        
Unrestricted cash multiplier 1.75        
Minimum aggregate appraised value plus liquidity threshold $ 350,000,000        
Long-term debt, gross   $ 50,000,000 50,000,000    
Unamortized discount and debt issuance costs   5,100,000 5,100,000    
Long-term debt   44,900,000 44,900,000    
Amortization of debt issuance costs   $ 400,000 $ 600,000    
Debt instrument, interest rate, effective percentage   14.50% 14.50%    
Revolving Credit Facility | Line of Credit | Interest Rate Application B          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.00%        
Revolving Credit Facility | Line of Credit | Interest Rate Application B | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 7.50%        
Revolving Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Interest Rate Application A          
Debt Instrument [Line Items]          
Basis spread on variable rate 8.50%        
Revolving Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Interest Rate Application A | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.00%        
Revolving Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Interest Rate Application B          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.00%        
Revolving Credit Facility | Line of Credit | Federal Funds Effective Swap Rate | Interest Rate Application B          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.50%