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Goodwill, In-Process Research and Development and Intellectual Property - Carrying Value of Company's IPR&D Assets and Change in Balance (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Finite-lived Intangible Assets [Roll Forward]        
Impairment of intangible assets $ (7,912) $ 0 $ (7,912) $ 0
In-Process Research and Development        
Finite-lived Intangible Assets [Roll Forward]        
Beginning balance     10,747  
Impairment of intangible assets     (7,912)  
Foreign currency translation impact     (435)  
Ending balance $ 2,400   $ 2,400