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REVENUE (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Total net product sales $ 80,717 $ 70,139 $ 155,004 $ 138,564
EXPAREL        
Disaggregation of Revenue [Line Items]        
Total net product sales 80,430 69,773 154,464 137,474
Other product sales        
Disaggregation of Revenue [Line Items]        
Total net product sales $ 287 $ 366 $ 540 $ 1,090
Minimum [Member]        
Disaggregation of Revenue [Line Items]        
Accounts Receivable, Additional Narrative Disclosure     0  
Maximum [Member]        
Disaggregation of Revenue [Line Items]        
Accounts Receivable, Additional Narrative Disclosure     37