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COLLABORATION AGREEMENTS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended
Dec. 31, 2013
Ezogabine Retigabine
Sep. 30, 2013
Non-recurring basis
Ezogabine Retigabine
Amortization and Impairments of Finite-lived Intangible Assets
Sep. 30, 2013
Non-recurring basis
Ezogabine Retigabine
In-process Research and Development Impairments and Other Charges
Dec. 31, 2013
Living Proof, Inc.
Neotensil
Maximum
Dec. 31, 2013
SMG
Bensal, HP
Maximum
Mar. 31, 2010
NicOx
Latanoprostene Bunod
Maximum
Jul. 31, 2013
Mimetogen
MIM-D3 compound
Maximum
Mar. 30, 2012
Collaborations
Medicis
Mar. 30, 2012
Collaborations
Development and license agreement with a specialty pharmaceutical company
Oct. 02, 2012
BMS Collaboration and Option Agreement
Dec. 31, 2012
BMS Collaboration and Option Agreement
Oct. 31, 2008
GSK
Ezogabine/retigabine
May 31, 2011
GSK
TrobaltTM
Apr. 30, 2012
GSK
PotigaTM
Collaboration Agreement                            
Consideration paid for rights       $ 15.0 $ 5.0   $ 95.0       $ 83.3      
Milestone payments in terms of collaboration and license agreements       62.5 80.0 162.5 345.0              
Term of additional rights                   2 years        
Potential contingent consideration payment               80.0 120.0          
GSK milestone payment, maximum percentage of royalty on net sales of product outside of the Collaboration Territory                       20.00% 20.00%  
GSK milestone payment, maximum percentage of royalty on net sales of backup compounds                       20.00%    
GSK milestone payment                         40.0 45.0
GSK milestone payment, maximum percentage of net profits shared on sales of product                           50.00%
Impairment charges $ 551.6 $ 551.6 $ 93.8