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COMMITMENTS AND CONTINGENCIES (Details 2) - USD ($)
$ in Millions
Mar. 21, 2007
Dec. 31, 2017
SkyePharma Holding, Inc.    
Commitments    
Total milestone payments paid   $ 36.0
SkyePharma Holding, Inc. | Maximum    
Commitments    
Milestone payments for EXPAREL agreed in connection with acquisition   $ 62.0
PPI-California    
Commitments    
Initial purchase price for acquisition $ 19.6