Financial risk management (Details) - CHF (SFr)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial risk management
Interest-bearing debt	SFr 0
Short-term debt	0	SFr 0
Long-term debt	SFr 0	SFr 0
Foreign exchange risk
Financial risk management
Subsequent period of currency transactions economically hedged	12 months
Foreign exchange risk \| EUR
Financial risk management
Percentage of reasonably possible increase in risk assumption	10.00%	10.00%	10.00%
Increase (decrease) in net income due to reasonably possible increase in risk assumption	SFr (19,920)	SFr (52,398)	SFr (11,144)
Increase (decrease) in shareholders' equity due to reasonably possible increase in risk assumption	SFr (19,920)	SFr (52,398)	SFr (11,144)
Percentage of reasonably possible decrease in risk assumption	(10.00%)	(10.00%)	(10.00%)
Increase (decrease) in net income due to reasonably possible decrease in risk assumption	SFr 19,920	SFr 52,398	SFr 11,144
Increase (decrease) in shareholders' equity due to reasonably possible decrease in risk assumption	SFr 19,920	SFr 52,398	SFr 11,144
Foreign exchange risk \| GBP
Financial risk management
Percentage of reasonably possible increase in risk assumption	10.00%	10.00%	10.00%
Increase (decrease) in net income due to reasonably possible increase in risk assumption	SFr (12,489)	SFr (15,965)	SFr (3,791)
Increase (decrease) in shareholders' equity due to reasonably possible increase in risk assumption	SFr (12,489)	SFr (15,965)	SFr (3,791)
Percentage of reasonably possible decrease in risk assumption	(10.00%)	(10.00%)	(10.00%)
Increase (decrease) in net income due to reasonably possible decrease in risk assumption	SFr 12,489	SFr 15,965	SFr 3,791
Increase (decrease) in shareholders' equity due to reasonably possible decrease in risk assumption	SFr 12,489	SFr 15,965	SFr 3,791
Foreign exchange risk \| USD
Financial risk management
Percentage of reasonably possible increase in risk assumption	10.00%	10.00%	10.00%
Increase (decrease) in net income due to reasonably possible increase in risk assumption	SFr 972,596	SFr 1,224,506	SFr 86,326
Increase (decrease) in shareholders' equity due to reasonably possible increase in risk assumption	SFr 972,596	SFr 1,224,506	SFr 86,326
Percentage of reasonably possible decrease in risk assumption	(10.00%)	(10.00%)	(10.00%)
Increase (decrease) in net income due to reasonably possible decrease in risk assumption	SFr (972,596)	SFr (1,224,506)	SFr (86,326)
Increase (decrease) in shareholders' equity due to reasonably possible decrease in risk assumption	SFr (972,596)	SFr (1,224,506)	SFr (86,326)
Foreign exchange risk \| Minimum
Financial risk management
Percentage of currency transactions economically hedged	50.00%
Foreign exchange risk \| Maximum
Financial risk management
Percentage of currency transactions economically hedged	100.00%
Interest rate risk
Financial risk management
Percentage of reasonably possible increase in risk assumption	10.00%
Percentage of reasonably possible decrease in risk assumption	(10.00%)

Increase (decrease) in equity due to reasonably possible decrease in designated risk component

No definition available.

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- Definition

Increase (decrease) in equity due to reasonably possible increase in designated risk component

+ References

No definition available.

+ Details

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- Definition

Increase (decrease) in profit or loss due to reasonably possible decrease in designated risk component

+ References

No definition available.

+ Details

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- Definition

Increase (decrease) in profit or loss due to reasonably possible increase in designated risk component

+ References

No definition available.

+ Details

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- Definition

Interest-bearing debt

+ References

No definition available.

+ Details

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- Definition

Percentage of currency transactions economically hedged

+ References

No definition available.

+ Details

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- Definition

Percentage of reasonably possible decrease in risk assumption

+ References

No definition available.

+ Details

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- Definition

Percentage of reasonably possible increase in risk assumption

+ References

No definition available.

+ Details

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- Definition

Subsequent period of currency transactions economically hedged

+ References

No definition available.

+ Details

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- Definition

The amount of current borrowings and current portion of non-current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

+ Details

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Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

+ Details

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- Details

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- Details

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