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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The option life of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The exercise price of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The percentage of an expected dividend used to calculate the fair value of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
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