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DEBT - 13% Senior Secured Notes due 2024 (Details)
12 Months Ended
Jul. 31, 2020
USD ($)
May 20, 2020
USD ($)
numberOfSeries
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 02, 2015
USD ($)
Debt Instrument [Line Items]          
Interest Expense, Debt     $ 6,870,000    
Senior Notes          
Debt Instrument [Line Items]          
Par value of debt         $ 575,000,000.0
Interest Expense, Debt     $ 4,347,000 $ 31,342,000  
13% Senior Secured Note due 2024 | Senior Notes          
Debt Instrument [Line Items]          
Interest rate   13.00% 13.00%    
Par value of debt   $ 95,000,000.0      
Number of series | numberOfSeries   2      
Amortization payments percent   10.00%      
Minimum liquidity ratio   9.5      
Minimum liquidity   $ 7,500,000      
Redemption of debt $ 10,000,000.0        
13% Senior Secured Note due 2024 | Senior Notes | Period One          
Debt Instrument [Line Items]          
Redemption price, percentage   100.00%      
13% Senior Secured Note due 2024 | Senior Notes | Period Two          
Debt Instrument [Line Items]          
Redemption price, percentage   100.00%      
Senior Secured Notes Due 2024, Series A-1 | Senior Notes          
Debt Instrument [Line Items]          
Par value of debt   $ 50,000,000.0      
Senior Secured Notes Due 2024, Series A-2 | Senior Notes          
Debt Instrument [Line Items]          
Par value of debt   $ 45,000,000.0