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Subsequent Event (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended
Jan. 31, 2016
USD ($)
program
platform
$ / shares
shares
Dec. 31, 2015
USD ($)
Subsequent Event [Line Items]    
Note receivable from Viking   $ 4,782
OMT, Inc. | Subsequent Event    
Subsequent Event [Line Items]    
Number of transgenic animal platforms | platform 3  
Number of partnered programs added | program 16  
Cash paid for acquisition $ 96,400  
Value of shares issued for acquisition $ 85,400  
Shares issued for acquisition (shares) | shares 793,594  
Weighted average price of shares issued (per share) | $ / shares $ 107.66  
Former Chief Executive Officer | OMT, Inc. | Subsequent Event    
Subsequent Event [Line Items]    
Aggregate value of stock options issued to former CEO of OMT, Inc. $ 2,000  
Aggregate value of performance stock units issued to former CEO of OMT, Inc. 18,000  
Secured Convertible Promissory Note    
Subsequent Event [Line Items]    
Interest rate on note due from Viking (percent)   5.00%
Secured Convertible Promissory Note | Subsequent Event    
Subsequent Event [Line Items]    
Note receivable from Viking $ 2,500  
Interest rate on note due from Viking (percent) 2.50%  
Extension of lock-up period 1 year  
Amount of loan to be repaid upon consummation of first capital financing transaction $ 1,500  
Amount of loan to be repaid in cash upon consummation of first capital financing transaction $ 300