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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-based compensation [Abstract] |
Share-based compensation plans outstanding | The following table summarizes equity-settled share option grants for plans that existed during the period: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of |  |  |  |
​ | ​ | options awarded | ​ | ​ | ​ | Contractual
Plan | ​ | (since inception) | ​ | Vesting conditions | ​ | life of options
Share option plan C1 |  | 6,775,250 | ​ | 4 years’ service from grant date |  | 10 years
2016 SOIP: |  |  |  |  |  |
Executives and directors |  | 3,277,044 |  | 1 year, 3 year and 4 years’ service from the date of grant, quarterly and annually |  | 10 years
Employees |  | 1,811,687 |  | 4 years’ service from the date of grant, annually |  | 10 years
​
Number and weighted average exercise prices of options under share option programs | The number and weighted-average exercise prices (in CHF) of options under the share option programs for Plans C1 and the 2016 SOIP are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  |  | Weighted- | ​ | Weighted-
​ | ​ | ​ | ​ | average | ​ | average
​ | ​ | Number of | ​ | exercise price | ​ | remaining
​ | ​ | options | ​ | (CHF) |  | term (years)
Outstanding at January 1, 2020 |  | 1,981,629 | ​ | 5.93 | ​ | 8.3
Forfeited during the year |  | (53,591) | ​ | 6.03 | ​ | —
Expired during the year | ​ | (26,729) | ​ | 4.38 | ​ | —
Exercised during the year |  | (73,669) | ​ | 2.00 | ​ | —
Granted during the year |  | 1,073,027 | ​ | 6.29 | ​ | —
Outstanding at December 31, 2020 |  | 2,900,667 | ​ | 5.90 | ​ | 8.2
Exercisable at December 31, 2020 |  | 1,099,015 | ​ | 5.49 | ​ | 7.0
Outstanding at January 1, 2021 |  | 2,900,667 | ​ | 5.90 | ​ | 8.2
Forfeited during the year |  | (207,331) | ​ | 6.13 | ​ | —
Exercised during the year |  | (218,561) | ​ | 4.97 | ​ | —
Granted during the year |  | 1,110,914 | ​ | 6.34 | ​ | —
Outstanding at December 31, 2021 |  | 3,585,689 | ​ | 6.21 | ​ | 7.8
Exercisable at December 31, 2021 |  | 1,613,242 | ​ | 6.13 | ​ | 6.8
Outstanding at January 1, 2022 |  | 3,585,689 | ​ | 6.21 | ​ | 7.8
Forfeited during the year |  | (304,738) | ​ | 6.32 | ​ | —
Exercised during the year |  | (110,250) | ​ | 0.15 | ​ | —
Granted during the year |  | 1,090,316 | ​ | 3.18 | ​ | —
Outstanding at December 31, 2022 |  | 4,261,017 |  | 5.65 | ​ | 7.6
Exercisable at December 31, 2022 |  | 2,345,648 |  | 6.41 | ​ | 6.6
​
Outstanding options, exercise price range and expiry dates | The outstanding stock options as of December 31, 2022 have the following range of exercise prices: ​
​ | ​ | ​ | ​ | ​
​ |  |  |  | Range of
​ | ​ | ​ | ​ | expiration
​ | ​ | Total options | ​ | dates
Range of exercise prices |  |  |  |
CHF 0.15 |  | 97,875 |  | 2022–2026
CHF 9.53 |  | 223,646 |  | 2027
USD 5.04 to USD 12.30 |  | 2,864,408 |  | 2028–2031
USD 2.76 to USD 4.57 | ​ | 1,075,088 | ​ | 2032
Total outstanding options |  | 4,261,017 |  |
​
Weighted-average assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended |
​ | ​ | December 31, |
​ | ​ | 2022 | ​ | 2021 | ​ | 2020 |
Exercise price (USD) |  | 2.76-4.57 |  | 5.31-7.72 |  | 5.04-9.16 | ​
Share price (weighted average) |  | 3.44 |  | 6.95 |  | 7.11 | ​
Risk-free interest rate |  | 0-2.4 | % | 0 | % | 0 | %
Expected volatility |  | 67-80 | % | 80 | % | 80 | %
Expected term (in years) |  | 5.5 - 6.25 |  | 5.1 - 6 |  | 5.5 - 6 | ​
Dividend yield |  | — |  | — |  | — | ​
Summary of non-vested share awards (restricted share and restricted share units) | A summary of non-vested share awards (restricted share and restricted share units) activity as of December 31, 2022 and changes during the year then ended is presented below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  |  |  | Contractual
​ | ​ | Number of | ​ | ​ | ​ | life of non-
​ | ​ | share awards | ​ | ​ | ​ | vested share
Grantee type | ​ | granted | ​ | Vesting conditions | ​ | awards
Restricted share units |  |  |  |  |  |
Directors |  | 159,025 |  | 1 year service from date of grant, annually |  | 10 years
Executives |  | 274,872 |  | 3 year and 4 years’ service from the date of grant, quarterly and semi-annually |  | 10 years
​
​ | ​ | ​ | ​ | ​
​ |  |  |  | Weighted-
​ | ​ | Number of | ​ | average
​ | ​ | non-vested | ​ | grant date fair
​ | ​ | shares | ​ | value (CHF)
Non-vested at January 1, 2020 |  | 42,763 | ​ | 9.52
Forfeited during the year |  | (11,828) | ​ | 9.47
Expired during the year |  | (7,804) | ​ | 9.52
Exercised during the year |  | (84,638) | ​ | 9.51
Granted during the year |  | — | ​ | —
Vested during the year |  | (23,269) | ​ | 9.52
Non-vested at December 31, 2020 |  | 19,494 | ​ | 9.51
Vested and exercisable at December 31, 2020 |  | 49,289 | ​ | 9.47
Non-vested at December 31, 2020 |  | 19,494 | ​ | 9.51
Exercised during the year |  | (2,471) | ​ | 9.46
Vested during the year |  | (18,697) | ​ | 9.52
Non-vested at December 31, 2021 |  | 797 | ​ | 9.41
Vested and exercisable at December 31, 2021 |  | 65,515 | ​ | 9.48
Non-vested at December 31, 2021 |  | 797 | ​ | 9.41
Granted during the year | ​ | 239,194 | ​ | 3.06
Vested during the year |  | (23,505) |  | 3.28
Non-vested at December 31, 2022 |  | 216,486 |  | 3.06
Vested and exercisable at December 31, 2022 |  | 89,020 |  | 7.84
​

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- Definition The disclosure of information about indirect, by reference to the fair value of the equity instruments granted, measurement of the fair value of goods or services received as consideration for the entity's share options. + 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 disclosure of the number and weighted average exercise prices of other equity instruments (ie other than share options). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
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