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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Intangible asset impairment $ 70.1 $ 70.1
In- Process Research and Development [Member]    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Intangible asset impairment 70.1  
Licensing Arrangements from Unrelated Third Party [Member]    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Payment to acquire licensing arrangements from an unrelated third party $ 192.5