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Related Parties - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Shin Nippon Biomedical Laboratories Ltd. (SNBL) [Member]        
Related Party Transaction [Line Items]        
Payment for contract research services   $ 100,000 $ 1,300,000 $ 200,000
Shin Nippon Biomedical Laboratories Ltd. (SNBL) [Member] | Maximum [Member]        
Related Party Transaction [Line Items]        
Payment for contract research services $ 100,000      
Scientific Advisor [Member] | Consulting Agreement [Member]        
Related Party Transaction [Line Items]        
Consulting agreement termination notice period     14 days  
Consulting service expenses     $ 13,000