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COMMERCIAL PARTNERS AND OTHER AGREEMENTS (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 05, 2012
Aug. 31, 2016
Jun. 30, 2016
Apr. 30, 2014
Dec. 31, 2013
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
COMMERCIAL PARTNERS AND OTHER AGREEMENTS                                
Revenues           $ 79,078,000 $ 67,335,000 $ 70,934,000 $ 69,283,000 $ 72,902,000 $ 68,355,000 $ 69,640,000 $ 65,474,000 $ 286,630,000 $ 276,371,000 $ 248,997,000
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation                           5,400,000    
Inventory Write-down                             20,700,000  
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax                           (4,868,000) 0 $ 0
Supplemental Unemployment Benefits, Severance Benefits           0       0       0 0  
Discontinued Operations - Residual Lease Costs           1,274,000       0       1,274,000 0  
Asset Retirement Obligation, Current           236,000       0       236,000 0  
Discontinued Operation, Amounts of Material Contingent Liabilities Remaining           1,510,000       $ 0       1,510,000 $ 0  
Severance Costs                           303,000    
Discontinued Operations - Remaining Lease Costs                           2,018,000    
Discontinued Operations - Fixed Asset and Inventory Writedown                           2,470,000    
Costs Incurred, Asset Retirement Obligation Incurred                           656,000    
Payments for Postemployment Benefits                           (303,000)    
Discontinued Operations, Payments For Lease Costs                           (744,000)    
Asset Retirement Obligation, Liabilities Settled                           (420,000)    
Disposal Group, Including Discontinued Operation, Operating Expense                           (1,467,000)    
Discontinued Operations Assets removed from Service                           (2,470,000)    
Total Change in Discontinued Operations Balance                           (2,470,000)    
Contract Termination Fee           7,100,000               7,100,000    
Contract Termination Fee, Current Portion           2,400,000               2,400,000    
Aratana                                
COMMERCIAL PARTNERS AND OTHER AGREEMENTS                                
Up-front payment received $ 1,000,000                              
Milestone payment received   $ 1,000,000 $ 1,000,000   $ 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 $ 40,000,000                              
Patheon [Member]                                
COMMERCIAL PARTNERS AND OTHER AGREEMENTS                                
Contract Termination Fee           $ 2,700,000.0               2,700,000.0    
Initial Term of Manufacturing Supply Agreement       10th                        
Mundipharma Ltd [Member]                                
COMMERCIAL PARTNERS AND OTHER AGREEMENTS                                
European Rights Expansion & New Distribution Payment       $ 8,000,000                        
Term Extension of 2003 Agreements       15                        
DepoCyte [Member]                                
COMMERCIAL PARTNERS AND OTHER AGREEMENTS                                
Percentage of total revenue                             2.60%  
Revenues                             $ 276,400,000  
Inventory Write-down               500,000                
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax               $ (4,900,000)           $ 5,447,000