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FAIR VALUE - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Aug. 31, 2019
Aug. 13, 2019
Dec. 31, 2018
Sep. 09, 2014
Convertible senior notes | 2.50% Convertible Notes due 2021                
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]                
Interest rate         2.50%     2.50%
Par value of debt           $ 145,000,000.0   $ 345,000,000
Convertible senior notes | 2.50% Convertible Notes due 2021 | Level 2                
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]                
Interest rate               2.50%
Par value of debt $ 145,000,000   $ 145,000,000       $ 345,000,000  
Convertible senior notes | 2.50% Convertible Notes due 2021 | Fair Value | Level 2                
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]                
Estimated fair value of debt 108,000,000   108,000,000       $ 231,800,000  
Convertible senior notes | 5.00% Convertible Notes due 2024                
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]                
Interest rate           5.00%    
Estimated fair value of debt           $ 98,400,000    
Par value of debt           $ 120,000,000    
Convertible senior notes | 5.00% Convertible Notes due 2024 | Level 2                
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]                
Interest rate           5.00%    
Par value of debt 120,000,000   120,000,000          
Convertible senior notes | 5.00% Convertible Notes due 2024 | Fair Value | Level 2                
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]                
Estimated fair value of debt 91,900,000   91,900,000          
Collegium warrants | Other (expense) income, net                
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]                
Fair value adjustment, recorded loss $ 1,400,000 $ 0 $ 4,900,000 $ 0