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IPR&D and Goodwill Intangible Assets and Goodwill - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
reporting_unit
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items]          
In-process research and development $ 17,628,000   $ 17,628,000   $ 17,628,000
Impairment on acquired IPR&D $ 0 $ 768,000 $ 0 $ 768,000  
Number of reporting units | reporting_unit     1    
Goodwill impairment loss     $ 0    
IPR&D          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Impairment on acquired IPR&D     $ 0