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DEBT - Long-term debt (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Total carrying amount of debt $ 1,293,738,000 $ 1,290,357,000
Less: debt, current 0 (90,892,000)
Debt, non-current 1,293,738,000 1,199,465,000
Convertible Notes | Notes due 2028    
Debt Instrument [Line Items]    
Long-term debt, gross 575,000,000 575,000,000
Less: unamortized debt issuance costs (5,408,000) (6,705,000)
Total carrying amount of debt 569,592,000 568,295,000
Convertible Notes | Notes due 2026    
Debt Instrument [Line Items]    
Long-term debt, gross 632,500,000 632,500,000
Less: unamortized debt issuance costs (4,317,000) (6,307,000)
Total carrying amount of debt 628,183,000 626,193,000
Convertible Notes | Notes due 2025    
Debt Instrument [Line Items]    
Long-term debt, gross 102,175,000 102,175,000
Less: unamortized debt discount (5,644,000) (10,229,000)
Less: unamortized debt issuance costs (568,000) (1,054,000)
Total carrying amount of debt 95,963,000 90,892,000
Less: debt, current (102,200,000)  
Convertible Notes | Notes due 2023    
Debt Instrument [Line Items]    
Long-term debt, gross 0 5,000,000
Less: unamortized debt issuance costs 0 (23,000)
Total carrying amount of debt $ 0 $ 4,977,000