Sponsored Research and Clinical Trial Agreements - summary of Aevitas expense related to its sponsored research agreements (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
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Mar. 31, 2019 |
Mar. 31, 2018 |
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| 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 |
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- Definition The amount of purchased research and development assets that are acquired in a business combination have no alternative future use and are therefore written off in the period of acquisition. No definition available.
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