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GOODWILL AND INTANGIBLE ASSETS (Tables)
12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of change in carrying value of goodwill
The change in the carrying value of goodwill is summarized as follows (in thousands):
 
 
Carrying Value
Balance at December 31, 2016
 
$
46,737

   Percentage payments on collections of net sales of DepoBupivacaine products, including EXPAREL
 
8,460

Balance at December 31, 2017
 
55,197

   Percentage payments on collections of net sales of DepoBupivacaine products, including EXPAREL
 
6,843

Balance at December 31, 2018
 
$
62,040