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Commitments and Contingencies - Indenture Obligations Under Convertible Notes (Details) - Convertible debt
$ in Thousands
Apr. 27, 2021
USD ($)
day
Apr. 13, 2021
Dec. 31, 2016
Dec. 21, 2016
Debt Instrument [Line Items]        
Interest rate on debt (in percentage) 4.50%   5.50% 5.50%
Four Point Five Zero Percent Convertible Senior Notes Due 2026        
Debt Instrument [Line Items]        
Interest rate on debt (in percentage) 4.50% 4.50%    
Number of days interest payments are in default 30      
Number of days after written notice of failure to comply 60      
Percentage of debt holders 25.00%      
Dollar amount of maximum default | $ $ 17,500      
Number of days in which to rescind or annul failure to pay or default 30      
Redemption price as a percentage of principal 100.00%