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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue Recognition [Line Items]        
Total research and development revenue $ 6,040 $ 5,211 $ 7,840 $ 11,624
JAPAN        
Revenue Recognition [Line Items]        
Total research and development revenue 3,063 5,211 3,396 11,624
UNITED STATES        
Revenue Recognition [Line Items]        
Total research and development revenue $ 2,977 $ 0 $ 4,444 $ 0