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LONG-TERM DEBT - Convertible Debt, Additional Information (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
May 17, 2018
USD ($)
Jul. 31, 2017
USD ($)
shares
Jul. 25, 2017
$ / shares
Dec. 31, 2020
USD ($)
numberOfDay
shares
$ / shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]            
Principal       $ 352,130    
Debt instrument, convertible, threshold percentage of conversion price trigger for redemption       130.00%    
Debt instrument, convertible, threshold trading days for redemption | numberOfDay       20    
Threshold consecutive trading days for redemption       30 days    
Repayments of outstanding borrowings on revolving credit facility       $ 35,000 $ 0 $ 0
Percentage of the maximum number of shares authorized for issuance       40.00%    
Percentage of maximum number of shares that would require cash settlement       60.00%    
Tax impact of convertible debt embedded derivative liability reclassification to equity $ 7,800          
Loss on convertible debt embedded derivative (see Note 10)       $ 0 0 $ (24,783)
Convertible debt            
Debt Instrument [Line Items]            
Issuance of convertible debt, face amount   $ 230,000   93,100    
Principal       $ 93,130 230,000  
Interest rate on convertible debt   5.00%   5.00%    
Repurchased face amount       $ 136,900    
Initial conversion rate, convertible debt       46.0829    
Initial conversion price, convertible debt | $ / shares       $ 21.70    
Conversion premium     40.00%      
Share price | $ / shares     $ 15.50      
Threshold trading days | numberOfDay       20    
Threshold consecutive trading days | numberOfDay       30    
Threshold percentage of stock price trigger       130.00%    
Number of business days after the specified trading price criteria met that notes may be converted | numberOfDay       5    
Consecutive trading days, trading price criteria       5 days    
Convertible debt, threshold percentage, product of common stock price and conversion price       98.00%    
Number of shares into which debt is convertible | shares   10,599,067   4,291,705    
Shares outstanding, percentage threshold   19.99%   19.99%    
Redemption price, percentage (equal to)       100.00%    
Repurchase of convertible debt   $ 222,300        
Debt discount       $ 7,156 $ 23,625  
Credit Facility | Not Designated as Hedging Instrument            
Debt Instrument [Line Items]            
Embedded derivative liability $ 45,400