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REVENUE (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
May. 31, 2014
May. 31, 2005
May. 31, 1995
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
REVENUE            
Deferred Revenue       $ 4,368 $ 5,297  
Product development and licensing agreements revenue       1,442 838 $ 160
Contracts and grants revenue       4,038 2,748 1,617
Product royalty expense           2,334
BMS | PD-1 Immune Checkpoint Inhibitor            
REVENUE            
Deferred Revenue $ 5,000          
Term of the agreement 5 years          
Reimbursement of external costs incurred by the company (as a percent) 50.00%          
Product development and licensing agreements revenue       1,300 700  
Rockefeller            
REVENUE            
Contracts and grants revenue       $ 3,400 $ 2,700 1,400
Collaboration arrangement for development and commercialization of oral rotavirus strain | Glaxo | Rotarix            
REVENUE            
Product royalty expense           $ 2,300
License agreements | Cincinnati Children's Hospital Medical Center | Rotarix            
REVENUE            
Percentage of license fee payable on net royalties received     30.00%      
Royalty Agreement | PRF | Rotarix            
REVENUE            
Percentage of interest in net royalties sold   70.00%