Other income - Narrative (Details) $ in Millions	Feb. 09, 2018 USD ($)
Clinical support agreement \| Foundation Fighting Blindness
Other Income [Line Items]
Contribution received to support clinical development	$ 7.5

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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