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Share-based compensation, Outstanding Options, Range of Exercise prices and Expiration Dates (Details) | 12 Months Ended |
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Dec. 31, 2022 Options SFr / shares | Dec. 31, 2022 Options $ / shares | Dec. 31, 2021 Options SFr / shares | Dec. 31, 2021 Options $ / shares | Dec. 31, 2020 Options SFr / shares | Dec. 31, 2020 Options $ / shares | Dec. 31, 2019 Options
Outstanding options, exercise price range and expiry dates [Abstract] |  |  |  |  |  |  |
Outstanding Options (in shares) | 4,261,017 | 4,261,017 | 3,585,689 | 3,585,689 | 2,900,667 | 2,900,667 | 1,981,629
Weighted average exercise price for options granted (in CHF/USD per share) | (per share) | SFr 3.18 | $ 3.44 | SFr 6.34 | $ 6.95 | SFr 6.29 | $ 7.11 |
Weighted average share price of common share options exercised (in dollars per share) | (per share) | 3.28 | 3.55 |  |  |  |  |
Minimum |  |  |  |  |  |  |
Outstanding options, exercise price range and expiry dates [Abstract] |  |  |  |  |  |  |
Weighted average exercise price for options granted (in CHF/USD per share) | (per share) | 0.15 | 2.76 |  |  |  |  |
Top of Range [Member] |  |  |  |  |  |  |
Outstanding options, exercise price range and expiry dates [Abstract] |  |  |  |  |  |  |
Weighted average exercise price for options granted (in CHF/USD per share) | (per share) | SFr 9.53 | $ 12.30 |  |  |  |  |
CHF 0.15 |  |  |  |  |  |  |
Outstanding options, exercise price range and expiry dates [Abstract] |  |  |  |  |  |  |
Outstanding Options (in shares) | 97,875 | 97,875 |  |  |  |  |
CHF 9.53 |  |  |  |  |  |  |
Outstanding options, exercise price range and expiry dates [Abstract] |  |  |  |  |  |  |
Outstanding Options (in shares) | 223,646 | 223,646 |  |  |  |  |
USD 5.04 to USD 12.30 |  |  |  |  |  |  |
Outstanding options, exercise price range and expiry dates [Abstract] |  |  |  |  |  |  |
Outstanding Options (in shares) | 2,864,408 | 2,864,408 |  |  |  |  |
USD 2.76 to USD 4.57 |  |  |  |  |  |  |
Outstanding options, exercise price range and expiry dates [Abstract] |  |  |  |  |  |  |
Outstanding Options (in shares) | 1,075,088 | 1,075,088 |  |  |  |  |

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