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Novartis Collaboration Agreement - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Jul. 31, 2009
Sep. 28, 2013
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Collaboration agreements revenue   $ 197.9
Novartis [Member] | Collaboration Agreement [Member] | 2012-2013 [Member]
   
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Share of revenue from assay that includes test for HCV 47.00%  
Novartis [Member] | Collaboration Agreement [Member] | 2014 [Member]
   
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Share of revenue from assay that includes test for HCV 48.00%  
Novartis [Member] | Collaboration Agreement [Member] | 2015 [Member]
   
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Share of revenue from assay that includes test for HCV 50.00%  
Blood screening [Member] | Novartis [Member] | Collaboration Agreement [Member]
   
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Collaboration agreement maturity date   Jun. 30, 2025
Manufacturing costs entitled to recover 50.00%  
Share of revenue from assay that excludes test for HCV 50.00%