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INTANGIBLE ASSETS - Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Total amortization expense $ 4,199 $ 4,171
Research and development    
Finite-Lived Intangible Assets [Line Items]    
Total amortization expense 103 81
Selling, general and administrative    
Finite-Lived Intangible Assets [Line Items]    
Total amortization expense $ 4,096 $ 4,090