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Operating expenses, Shares Held by Directors and Executives (Details) - shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating expense [Abstract] |  |  |  |
Number of shares held by Directors and Executives as a group (in shares) | [1] | 1,908,331 | 2,958,894 | 2,303,011
Number of restricted stock subject to vesting conditions (in shares) |  | 595,832 | 725,665 | 619,998
Period of base salary entitled to executive officer in connection with termination of employment |  | 18 months |  |
[1] | Includes 595,832 (2021: 725,665, 2020: 619,998) shares of restricted stock subject to vesting conditions.

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- Definition The number of other equity instruments (ie other than share options) subject to vesting conditions in a share-based payment arrangement. + References No definition available. + Details
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- Definition The number of shares held by directors and executives as a group during the period. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Period of base salary entitled to an executive officer upon termination of employment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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