Share-based compensation - Share purchase plan (Details) - Share purchase plan	12 Months Ended
Dec. 31, 2019 CHF (SFr) EquityInstruments	Dec. 31, 2018 CHF (SFr) EquityInstruments	Dec. 31, 2017 CHF (SFr) EquityInstruments
Share-based compensation
Shares transferred to settle expense \| EquityInstruments	196,610	87,176	132,096
Consulting fees settled in shares \| SFr	SFr 289,214	SFr 208,085	SFr 258,903

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

No definition available.

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- Definition

The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets]

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- Definition

The number of instruments granted in share-based payment arrangement.

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