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Share-based compensation - Option activity and weighted-average assumptions (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Weighted average exercise price |  |  |  |
Total weighted average grant date fair value of options issued during the period (in $ millions) |  |  | $ 23.2 |
Proceeds from option sales during the period (in $ millions) |  |  | $ 1.8 |
2014 Plan |  |  |  |
Weighted average exercise price |  |  |  |
Vesting period (in years) |  |  | 4 years |
2014 Plan | Share options |  |  |  |
Options |  |  |  |
Outstanding at beginning of the period (in shares) |  |  | 2,659,279 |
Granted (in shares) |  |  | 1,088,843 |
Forfeited (in shares) |  |  | (233,777) |
Expired (in shares) |  |  | (14,146) |
Exercised (in shares) |  |  | (156,787) |
Outstanding at end of the period (in shares) | 3,343,412 |  | 3,343,412 |
Thereof, fully vested and exercisable at end of period (in shares) | 1,792,291 |  | 1,792,291 |
Thereof, outstanding and expected to vest at end of period (in shares) | 1,551,121 |  | 1,551,121 |
Weighted average exercise price |  |  |  |
Outstanding at beginning of the period (in dollars per share) |  |  | $ 28.13 |
Granted (in dollars per share) |  |  | 36.37 |
Forfeited (in dollars per share) |  |  | 40.81 |
Expired (in dollars per share) |  |  | 45.59 |
Exercised (in dollars per share) |  |  | 11.65 |
Outstanding at end of period (in dollars per share) | $ 30.63 |  | 30.63 |
Thereof, fully vested and exercisable at end of period (in dollars per share) | $ 23.14 |  | 23.14 |
Outstanding and expected to vest at end of the period (in dollars per share) |  |  | $ 39.28 |
Weighted-average assumptions used to estimate fair value of share options granted during year |  |  |  |
Expected volatility (as a percent) | 75.00% | 70.00% | 75.00% | 70.00%
Expected terms (in years) | 10 years | 10 years | 10 years | 10 years
Risk free interest rate (as a percent) | 1.47% | 0.84% |  |
Risk free interest rate, minimum (as a percent) | 1.47% | 0.84% | 1.21% | 0.76%
Risk free interest rate, maximum (as a percent) |  |  | 1.85% | 1.44%
Expected dividend (as a percent) | 0.00% | 0.00% | 0.00% | 0.00%
2014 Plan | Non-executive directors |  |  |  |
Weighted average exercise price |  |  |  |
Vesting period (in years) |  |  | 1 year |
2014 Plan | One year from grant date |  |  |  |
Weighted average exercise price |  |  |  |
Vesting percentage per year |  |  | 25.00% |
Vesting period (in years) |  |  | 1 year |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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