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SIGNIFICANT TRANSACTIONS - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Significant Transactions [Line Items]            
Revenue $ 24,729 $ 21,993 $ 71,520 $ 55,695    
CVie Therapeutics            
Significant Transactions [Line Items]            
Collaboration arrangement receivable           $ 11,000
Revenue 34 $ 36 82 $ 69    
Deferred revenue 640   640   $ 723  
CVie Therapeutics | Up-front Payment Arrangement            
Significant Transactions [Line Items]            
Collaboration arrangement payment           $ 1,000
Novellus Plan            
Significant Transactions [Line Items]            
Deferred revenue $ 500   $ 500      
Novellus Plan | Up-front Payment Arrangement            
Significant Transactions [Line Items]            
Collaboration arrangement payment         500  
Collaboration arrangement receivable         $ 5,200