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INTANGIBLE ASSETS - Gross Carrying amount and Accumulated Amortization (Details) - Nucynta Products - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jan. 09, 2018
Gross carrying amount $ 154,089 $ 154,089 $ 515,627
Accumulated amortization (124,586) (109,834)  
Intangible assets, net $ 29,503 $ 44,255