Quarterly report pursuant to Section 13 or 15(d)

Sponsored Research and Clinical Trial Agreements - summary of Aevitas expense related to its sponsored research agreements (Detail)

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Sponsored Research and Clinical Trial Agreements - summary of Aevitas expense related to its sponsored research agreements (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Research and Development in Process $ 450 $ 97
Research and clinical trial agreements [Member] | Aevitas Therapeutics Inc [Member]    
Research and Development in Process 250 100
Research and clinical trial agreements [Member] | Aevitas Therapeutics Inc [Member] | UMass – AAV [Member]    
Research and Development in Process 0 100
Research and clinical trial agreements [Member] | Aevitas Therapeutics Inc [Member] | UPenn – AAV [Member]    
Research and Development in Process $ 250 $ 0