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Commitments and Contingencies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2015
Option
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Commitment And Contingencies [Line Items]          
Lease expiration date Jul. 31, 2017        
Lease extension period 3 years        
Number of options to extend lease | Option 2        
Operating lease, rental expense   $ 79,000 $ 27,000 $ 137,000 $ 52,000
Subsequent Licensed Product [Member]          
Commitment And Contingencies [Line Items]          
Licensing fees per product maximum   1,250,000   1,250,000  
Maximum [Member] | Pre Commercialization Milestones [Member]          
Commitment And Contingencies [Line Items]          
Milestone payments   12,250,000   12,250,000  
Maximum [Member] | Product Commercialization Milestones [Member]          
Commitment And Contingencies [Line Items]          
Milestone payments   $ 12,500,000   $ 12,500,000  
Office Two [Member]          
Commitment And Contingencies [Line Items]          
Lease expiration date       Jul. 31, 2017  
Lease extension period       3 years