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Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Segments
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Organization and Summary of Significant Accounting Policies [Line Items]      
Liquid investments purchased with original maturities three months or less    
Restricted cash   $ 320  
Percentage of likelihood of indefinite lived intangible assets being impaired 50.00%    
Impairment charge $ 1,870    
Change in fair value of contingent liability $ (1,800) $ 230 $ 60
Stock options and restricted stock units outstanding | shares 9,008,185 8,905,782 9,469,521
Number of operating segments | Segments 1    
Shire AG [Member] | Customer Concentration Risk [Member] | Total revenues [Member]      
Organization and Summary of Significant Accounting Policies [Line Items]      
Percentage of revenues 40.00% 57.00% 68.00%
Biogen Inc [Member] | Customer Concentration Risk [Member] | Total revenues [Member]      
Organization and Summary of Significant Accounting Policies [Line Items]      
Percentage of revenues 35.00% 28.00%  
Sigma-Aldrich Corporation [Member] | Customer Concentration Risk [Member] | Total revenues [Member]      
Organization and Summary of Significant Accounting Policies [Line Items]      
Percentage of revenues     9.00%
Dow AgroSciences LLC [Member] | Customer Concentration Risk [Member] | Total revenues [Member]      
Organization and Summary of Significant Accounting Policies [Line Items]      
Percentage of revenues     12.00%
Minimum [Member]      
Organization and Summary of Significant Accounting Policies [Line Items]      
Estimated useful lives of related assets 3 years    
Maximum [Member]      
Organization and Summary of Significant Accounting Policies [Line Items]      
Estimated useful lives of related assets 5 years