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
Mar. 31, 2020
Mar. 31, 2019
Revenue Recognition [Line Items]    
Total research and development revenue $ 1,800 $ 6,413
JAPAN    
Revenue Recognition [Line Items]    
Total research and development revenue 333 6,413
UNITED STATES    
Revenue Recognition [Line Items]    
Total research and development revenue $ 1,467 $ 0