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Long-Term Debt - Narrative (Details)
3 Months Ended 4 Months Ended
Mar. 31, 2018
USD ($)
Aug. 14, 2019
USD ($)
Dec. 31, 2017
USD ($)
Dec. 29, 2017
USD ($)
quarter
Debt Instrument [Line Items]        
Debt amortization period 5 years 6 months      
Interest expense, back end fees $ 2,000,000      
Debt issuance costs     $ 2,140,000  
Senior Notes        
Debt Instrument [Line Items]        
Amortization of debt discount 1,000,000      
Senior Notes | Note Purchase Agreement        
Debt Instrument [Line Items]        
Unused borrowing capacity       $ 100,000,000
Face amount $ 75,000,000   75,000,000  
Stated interest rate 11.19%     9.00%
Upfront fee       1.00%
Exit fee       2.00%
Interest expense, debt $ 2,193,000      
Unamortized debt issuance costs $ 2,130,000   $ 2,139,000  
Senior Notes | Note Purchase Agreement | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Interest rate floor       1.00%
Senior Notes | Note Purchase Agreement - Delayed Draw Notes        
Debt Instrument [Line Items]        
Unused borrowing capacity       $ 25,000,000
Number of trailing quarters | quarter       4
Scenario, Forecast | Senior Notes | Note Purchase Agreement - Delayed Draw Notes        
Debt Instrument [Line Items]        
Total debt to trailing four quarter net revenues   6.50    
Revenue, net   $ 15,000,000