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DEBT - Narrative (Details)
May 20, 2020
USD ($)
series
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Apr. 08, 2020
USD ($)
Feb. 19, 2020
USD ($)
Aug. 13, 2019
USD ($)
Apr. 02, 2015
USD ($)
Sep. 09, 2014
USD ($)
Debt Instrument [Line Items]                
Gross, long-term debt   $ 78,667,000 $ 84,118,000          
Current portion of long-term debt   12,257,000 11,942,000          
Non-current portion of long-term debt   66,410,000 72,160,000          
Long-term debt   78,667,000 84,102,000          
Royalty rights obligation                
Debt Instrument [Line Items]                
Gross, long-term debt   3,200,000            
Royalty rights obligation | Royalties, Current                
Debt Instrument [Line Items]                
Royalty rights obligations   2,800,000            
Royalty rights obligation | Royalties, Noncurrent                
Debt Instrument [Line Items]                
Royalty rights obligations   $ 400,000            
Senior Notes | 13% Senior Secured Note due 2024                
Debt Instrument [Line Items]                
Interest rate 13.00% 13.00%            
Aggregate principal amount $ 95,000,000              
Number of series issued | series 2              
Interest rate, outstanding principal 10.00%              
Covenant, liquidity ratio quotient 9.5              
Covenant, minimum liquidity ratio, amount $ 7,500,000              
Gross, long-term debt   $ 75,500,000 80,250,000          
Current portion of long-term debt   9,500,000            
Non-current portion of long-term debt   66,000,000            
Senior Notes | 13% Senior Secured Note due 2024 | Debt Instrument, Redemption, Period One                
Debt Instrument [Line Items]                
Redemption price, percent 100.00%              
Senior Notes | 13% Senior Secured Note due 2024 | Debt Instrument, Redemption, Period Two                
Debt Instrument [Line Items]                
Redemption price, percent 100.00%              
Senior Notes | Secured Notes, Series A-1 Notes                
Debt Instrument [Line Items]                
Aggregate principal amount $ 50,000,000              
Senior Notes | Secured Notes, Series A-2 Notes                
Debt Instrument [Line Items]                
Aggregate principal amount $ 45,000,000              
Senior Notes | Royalty rights obligation                
Debt Instrument [Line Items]                
Gross, long-term debt   $ 3,167,000 3,533,000          
Royalty payments, percentage of revenue 1.50%              
Senior Notes | Senior Secured Notes                
Debt Instrument [Line Items]                
Aggregate principal amount             $ 575,000,000  
Convertible notes | 2.50% Convertible Notes due 2021                
Debt Instrument [Line Items]                
Interest rate   2.50%           2.50%
Aggregate principal amount               $ 345,000,000
Gross, long-term debt   $ 0 335,000          
Repurchased aggregate principal amount       $ 42,100,000 $ 102,500,000      
Long-term debt   $ 0 300,000          
Convertible notes | 5% Convertible Senior Notes Due 2024                
Debt Instrument [Line Items]                
Interest rate   5.00%       5.00%    
Aggregate principal amount           $ 120,000,000    
Repurchased aggregate principal amount       $ 34,500,000 $ 85,500,000      
Long-term debt     $ 0