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Share-based compensation - Stock appreciation rights - Changes in SARs (Details) - Stock appreciation rights | 9 Months Ended
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Sep. 30, 2021 $ / shares shares
Balance, No. of Units (Beginning) | shares | 3,094,003
Balance, Weighted average exercise price (Begining) | $ / shares | $ 6.80
SARs granted during the year ended | shares | 610,691
SARs granted during the year ended | $ / shares | $ 4.28
Balance, No. of Units (Ending) (none of which are exercisable or convertible) | shares | 3,704,694
Balance, Weighted average exercise price (Ending) | $ / shares | $ 6.40

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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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Period Type: | instant

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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://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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Details
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