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Leases (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
ft²
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Minimum lease payments      
2017 $ 2,666,000    
2018 2,483,000    
2019 2,421,000    
2020 2,349,000    
2021 and beyond 10,537,000    
Total 20,456,000    
Rent expense, including fees for utilities and common area maintenances 3,500,000 $ 2,600,000 $ 2,400,000
Capital Leases      
Capital lease obligation   $ 0  
Equipment      
Capital Leases      
Capital lease obligation $ 900,000    
Capital leases, interest rate, minimum 0.20%    
Capital leases, interest rate, maximum 5.70%    
2017 $ 355,000    
2018 355,000    
2019 134,000    
Total principle obligation $ 844,000    
Equipment | Minimum      
Capital Leases      
Term of capital lease (in months) 36 months    
Equipment | Maximum      
Capital Leases      
Term of capital lease (in months) 48 months    
Cranbury, New Jersey | Office and laboratory space      
Operating Leases      
Area of space leased (in square feet) | ft² 90,000    
Durham, North Carolina | Office space      
Operating Leases      
Area of space leased (in square feet) | ft² 5,603    
Buckinghamshire, United Kingdom | Office space      
Operating Leases      
Area of space leased (in square feet) | ft² 9,821    
Munich, Germany | Office space      
Operating Leases      
Area of space leased (in square feet) | ft² 4,316