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Collaboration Agreement - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research Term, in months     30 years  
Upfront payment received     $ 1,750,000  
Milestone payments receivable $ 25,000,000   25,000,000  
Collaboration revenue 114,000 $ 761,000 358,000 $ 1,329,000
Milestone or royalty payments received 0      
Upon the Achievement of Specified Preclinical and Clinical Development Milestone Events [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Milestone payments receivable 10,000,000.0   10,000,000.0  
Upon the Achievement of Specified Regulatory Milestone Events [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Milestone payments receivable $ 15,000,000.0   $ 15,000,000.0