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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
May 15, 2014
Office Two [Member]
Sep. 30, 2014
Office Two [Member]
Sep. 30, 2014
Pre Commercialization Milestones [Member]
Sep. 30, 2014
Product Commercialization Milestones [Member]
Sep. 30, 2014
Subsequent Licensed Product [Member]
Sep. 30, 2014
Development Based Milestones [Member]
Commitment And Contingencies [Line Items]                    
Lease expiration period           Jul. 31, 2017        
Lease extension period         3 years          
Operating lease, rental expense $ 52 $ 23 $ 104 $ 87            
Milestone payments             12,250 12,500    
Licensing fees per product maximum                 1,250  
Milestone payments due                   $ 6,700