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Loss on Sale of Nonfinancial Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Loss on transfer of non-financial assets (Note 16) $ 4,004 $ 0 $ 4,004 $ 0
Indefinite-lived Intangible Assets [Line Items]        
Proceeds from transfer of non-financial assets 900   896  
IPR&D        
Indefinite-lived Intangible Assets [Line Items]        
Intangible assets $ 4,900   $ 4,900