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Share-based compensation - Option activity and weighted-average assumptions (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Weighted average exercise price |  |  |
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options | $ 1,445 | $ 2,798 | $ 7,444
2014 Plan |  |  |
Options |  |  |
Thereof, outstanding and expected to vest after at end of period (in shares) | 2,098,557 | 1,521,500 |
Weighted average exercise price |  |  |
Outstanding and expected to vest after at end of the period (in dollars per share) | $ 13.46 | $ 22.52 |
Total weighted average grant date fair value of options issued during the period (in $ millions) | $ 12,900 |  |
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options | $ 1,300 |  |
Vesting period (in years) | 4 years |  |
Weighted-average assumptions used to estimate fair value of share options granted during year |  |  |
Expected volatility (as a percent) | 70.00% | 75.00% | 70.00%
Expected terms (in years) | 10 years | 10 years | 10 years
Risk free interest rate, minimum (as a percent) | 2.12% | 1.21% | 0.76%
Risk free interest rate, maximum (as a percent) | 4.16% | 1.86% | 1.44%
Expected dividend (as a percent) | 0.00% | 0.00% | 0.00%
2014 Plan | Minimum |  |  |
Weighted-average assumptions used to estimate fair value of share options granted during year |  |  |
Expected volatility (as a percent) |  |  | 70.00%
2014 Plan | Share options |  |  |
Options |  |  |
Outstanding at beginning of the period (in shares) | 3,308,325 |  |
Granted (in shares) | 1,426,966 | 1,174,893 | 653,852
Forfeited (in shares) | (204,224) |  |
Expired (in shares) | (154,794) |  |
Exercised (in shares) | (138,356) | (241,496) | (498,678)
Outstanding at end of the period (in shares) | 4,237,917 | 3,308,325 |
Thereof, fully vested and exercisable at end of period (in shares) | 2,139,360 |  |
Thereof, outstanding and expected to vest after at end of period (in shares) | 2,098,557 | 1,521,500 |
Weighted average exercise price |  |  |
Outstanding at beginning of the period (in dollars per share) | $ 31.02 |  |
Granted (in dollars per share) | 15.90 |  |
Forfeited (in dollars per share) | 38.29 |  |
Expired (in dollars per share) | 36.86 |  |
Exercised (in dollars per share) | 7.81 |  |
Outstanding at end of period (in dollars per share) | 26.13 | $ 31.02 |
Thereof, fully vested and exercisable at end of period (in dollars per share) | 28.82 |  |
Outstanding and expected to vest after at end of the period (in dollars per share) | $ 23.38 | $ 38.71 |
Weighted average remaining contractual life (in years) |  |  |
Outstanding | 7 years 1 month 20 days | 7 years 18 days |
Thereof, fully vested and exercisable at end of year | 5 years 5 months 12 days |  |
Outstanding and expected to vest at end of year | 8 years 10 months 9 days |  |
Aggregate intrinsic value |  |  |
Outstanding (in dollars) | $ 17,848 | $ 8,660 |
Thereof, fully vested and exercisable | 8,339 |  |
Outstanding and expected to vest | 9,509 |  |
Exercised (in dollars) | $ 1,848 | $ 5,046 | $ 11,927
Weighted average grant-date fair value |  |  |
Vested (in shares) | 652,635 |  |
Forfeited (in dollar per share) | $ 22.17 |  |
2014 Plan | Non-executive directors |  |  |
Weighted average exercise price |  |  |
Vesting period (in years) | 1 year |  |
2014 Plan | Directors and Officers |  |  |
Options |  |  |
Granted (in shares) | 672,908 |  |
Weighted average exercise price |  |  |
Granted (in dollars per share) | $ 5.9 |  |
2014 Plan | One year from grant date |  |  |
Weighted average exercise price |  |  |
Vesting percentage per year | 25.00% |  |
Vesting period (in years) | 1 year |  |
2012 Plan |  |  |
Options |  |  |
Outstanding at beginning of the period (in shares) | 14,000 |  |
Outstanding at end of the period (in shares) | 0 | 14,000 |

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- Definition Weighted average remaining contractual term for vested portions of options outstanding and expected to vest or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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