Other income - Narrative (Details) - Clinical support agreement - Foundation Fighting Blindness $ in Millions	Feb. 09, 2018 USD ($)
Other Income [Line Items]
Agreed funding	$ 7.5
Granted funding	$ 6.8

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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