| Revenue - (Details) - GlaxoSmithKline Intellectual Property Development Ltd | 9 Months Ended | 
|---|---|
| Sep. 30, 2019  customer  location  contract | |
| Revenue | |
| Number of customers | customer | 1 | 
| Number of geographic locations | location | 1 | 
| Number of contracts with customers | contract | 1 | 
| X | ||||||||||
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- Definition Represents the total number of contracts with customers. No definition available. 
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| X | ||||||||||
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- Definition Represents the number of customers. No definition available. 
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| X | ||||||||||
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- Definition Represents the number of geographic locations. No definition available. 
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| X | ||||||||||
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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| X | ||||||||||
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- Details 
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