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Contingencies and commitments (MVASI Patent Litigation) (Details) - Mvasi Patent Litigation, Genentech, Inc. (Genentech) and the City of Hope [Member] - patent	Aug. 31, 2018	Oct. 18, 2017	Oct. 06, 2017
Other Commitments [Line Items]
Number of patents allegedly infringed			27
Loss contingency, patents allegedly infringed	8	25	24

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- Definition

Number of entity's patents that another entity has allegedly infringed.

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- Definition

Number of another entity's patents that the entity has allegedly infringed.

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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.

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No definition available.

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