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Development Derivative Liability - Schedule of Development Derivative Liability (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]                
Balance at fair market value $ 220,475 $ 223,245 $ 134,839 $ 109,840 $ 60,736   $ 134,839  
Amounts received under the SFJ agreement and SFJ amendment     20,000 20,000 40,000 $ 60,000    
(Gain)/loss recorded in loss from remeasurement of development derivative liability (2,697) (2,770) 68,406 263 9,104 736 62,939 $ 10,103
Balance at fair market value $ 217,778 $ 220,475 $ 223,245 $ 130,103 $ 109,840 $ 60,736 $ 217,778 $ 130,103