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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 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Finite-lived Intangible Assets [Roll Forward]      
Additions     $ 10,633
Impairment $ (7,900) $ (7,912) 0
In-Process Research and Development      
Finite-lived Intangible Assets [Roll Forward]      
Beginning balance   10,747 0
Foreign currency translation impact   (365) 114
Impairment   (7,912)  
Ending balance   $ 2,470 $ 10,747