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Share-based compensation, Weighted Average Grant date Fair Value and Assumptions (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) Y $ / shares	Dec. 31, 2021 USD ($) Y $ / shares	Dec. 31, 2020 USD ($) Y $ / shares	Dec. 31, 2022 CHF (SFr)	Dec. 31, 2021 CHF (SFr)	Dec. 31, 2020 CHF (SFr)
Number and weighted average exercise prices of options under the share option programs [Abstract]
Weighted average fair value at measurement date, share options granted	$ 2.38	$ 5.23	$ 5.25	SFr 2.20	SFr 4.78	SFr 4.65
Weighted average assumptions [Abstract]
Share price (weighted average)	$ 3.44	$ 6.95	$ 7.11
Risk free interest rate		0.00%	0.00%
Expected volatility		80.00%	80.00%
Dividend yield	0.00%	0.00%	0.00%
Minimum
Weighted average assumptions [Abstract]
Exercise price (in USD per share)	$ 2.76	$ 5.31	$ 5.04
Risk free interest rate	0.00%
Expected volatility	67.00%
Expected term | Y	5.5	5.1	5.5
Top of Range [Member]
Weighted average assumptions [Abstract]
Exercise price (in USD per share)	$ 4.57	$ 7.72	$ 9.16
Risk free interest rate	2.40%
Expected volatility	80.00%
Expected term | Y	6.25	6	6

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The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

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The option life of share options granted.

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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The exercise price of share options granted.

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The percentage of an expected dividend used to calculate the fair value of share options granted.

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The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

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The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

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