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Credit Facility and Convertible Debentures - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 15, 2019
May 31, 2018
Jul. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]              
Repayments of debt     $ 49,500,000        
Repurchased face amount     44,500,000        
Interest repaid     4,100,000        
Accrued interest repaid     900,000        
Repayments of lines of credit           $ 68,568,000 $ 0
Gain (loss) from covenant liability       $ (4,100,000)   (5,100,000)  
Interest expense       5,806,000 $ 3,310,000 14,023,000 9,422,000
Revolving Credit Facility              
Debt Instrument [Line Items]              
Cash and cash equivalent threshold   $ 50,000,000          
Revolving Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Interest expense       $ 5,800,000 3,300,000 $ 14,000,000 8,000,000
Debt instrument, interest rate, effective percentage       15.10%   15.10%  
Interest paid       $ 5,000,000 $ 2,400,000 $ 11,500,000 $ 4,900,000
Credit Facility | Revolving Credit Facility | Interest Rate Application A | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Basis spread on variable rate   8.50%          
Credit Facility | Revolving Credit Facility | Interest Rate Application A | London Interbank Offered Rate (LIBOR) | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate   1.00%          
Credit Facility | Revolving Credit Facility | Interest Rate Application B              
Debt Instrument [Line Items]              
Basis spread on variable rate   2.00%          
Credit Facility | Revolving Credit Facility | Interest Rate Application B | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate   7.50%          
Credit Facility | Revolving Credit Facility | Interest Rate Application B | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Basis spread on variable rate   1.00%          
Credit Facility | Revolving Credit Facility | Interest Rate Application B | Federal Funds Effective Swap Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate   0.50%          
Amended Credit Facility              
Debt Instrument [Line Items]              
Cash and cash equivalent threshold   $ 50,000,000   50,000,000   50,000,000  
Repayments of lines of credit $ 24,000,000            
Periodic payment, interest $ 2,900,000            
Extinguishment of debt, amount     44,500,000        
Liquidity threshold   20,000,000          
Minimum aggregate appraised value plus liquidity threshold   350,000,000          
Deployment threshold   40,000,000.0          
Expense threshold   11,500,000.0          
Credit facility repayment feature   $ 500,000   $ 5,100,000   $ 5,100,000  
Interest expense     $ 4,100,000