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COMMERCIAL PARTNERS AND OTHER AGREEMENTS (Details) - USD ($)
1 Months Ended
Dec. 05, 2012
Apr. 30, 2014
Dec. 31, 2013
Dec. 31, 2015
Aratana        
COMMERCIAL PARTNERS AND OTHER AGREEMENTS        
Up-front payment received $ 1,000,000      
Milestone payment received     $ 500,000  
Aratana | Maximum | Achievement of development and commercial milestones        
COMMERCIAL PARTNERS AND OTHER AGREEMENTS        
Milestone payments Company is entitled to receive based on terms of agreement $ 42,500,000      
Patheon [Member]        
COMMERCIAL PARTNERS AND OTHER AGREEMENTS        
Contract Termination Fee       $ 2,400,000.0
Initial Term of Manufacturing Supply Agreement   10th    
Mundipharma Ltd [Member]        
COMMERCIAL PARTNERS AND OTHER AGREEMENTS        
Term Extension of 2003 Agreements   P15Y    
European Rights Expansion & New Distribution Payment   $ 0