Quarterly report pursuant to Section 13 or 15(d)

Research and Development Agreements - Schedule of Research and Development Revenues Disaggregated by Location (Detail)

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Research and Development Agreements - Schedule of Research and Development Revenues Disaggregated by Location (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue Recognition [Line Items]        
Total research and development revenue $ 4,298 $ 3,187 $ 12,138 $ 14,811
JAPAN        
Revenue Recognition [Line Items]        
Total research and development revenue 1,566 2,903 4,962 14,527
UNITED STATES        
Revenue Recognition [Line Items]        
Total research and development revenue $ 2,732 $ 284 $ 7,176 $ 284