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DEBT - Narrative (Details)
May 20, 2020
USD ($)
series
Sep. 09, 2014
USD ($)
trading_day
$ / shares
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Apr. 08, 2020
USD ($)
Feb. 19, 2020
USD ($)
Apr. 02, 2015
USD ($)
Debt Instrument [Line Items]              
Gross, long-term debt     $ 78,973,000 $ 84,118,000      
Current portion of long-term debt     12,222,000 11,942,000      
Non-current portion of long-term debt     66,751,000 72,160,000      
Long-term debt     $ 78,973,000 84,102,000      
Senior Notes | 13% Senior Secured Note due 2024              
Debt Instrument [Line Items]              
Interest rate 13.00%   13.00%        
Aggregate principal amount $ 95,000,000.0            
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     66,000,000.0        
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 $ 50,000,000.0            
Senior Notes | Secured Notes, Series A-2 Notes              
Debt Instrument [Line Items]              
Aggregate principal amount $ 45,000,000.0            
Senior Notes | Royalty rights obligation              
Debt Instrument [Line Items]              
Gross, long-term debt     3,138,000 3,533,000      
Royalty payments, percentage of revenue 1.50%            
Senior Notes | Royalty rights obligation | Royalties, Current              
Debt Instrument [Line Items]              
Royalty rights obligations     2,400,000        
Senior Notes | Royalty rights obligation | Royalties, Noncurrent              
Debt Instrument [Line Items]              
Royalty rights obligations     $ 700,000        
Senior Notes | Senior Notes Issued April 2015              
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   $ 345,000,000.0          
Gross, long-term debt     $ 335,000 335,000      
Repurchased aggregate principal amount         $ 42,100,000 $ 102,500,000  
Long-term debt     $ 300,000 300,000      
Conversion ratio   0.0129963          
Conversion price (in dollars per share) | $ / shares   $ 76.96          
Threshold consecutive trading days | trading_day   40          
Convertible notes | Convertible Senior Notes, 5.0%              
Debt Instrument [Line Items]              
Interest rate     5.00%        
Aggregate principal amount     $ 120,000,000.0        
Repurchased aggregate principal amount         $ 34,500,000 $ 85,500,000  
Long-term debt       $ 0