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License Agreement With Massachusetts General Hospital - Estimated Annual Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
2016 $ 650  
2017 650  
2018 650  
2019 650  
2020 650  
Thereafter 1,842  
Intangible asset, net $ 5,092 $ 5,780