Share-based payments - Summary of Options Granted Priced Using Black Scholes for SARs, Tandem Awards, Converted Options, Matching Stock Options and Monte Carlo Option Pricing Model (Detail) - Additional Grants Under 2020 and 2022 Plan [Member] |
12 Months Ended | ||
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Dec. 31, 2025
yr
$ / shares
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Dec. 31, 2024
yr
$ / shares
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Dec. 31, 2023
yr
$ / shares
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| Disclosure of terms and conditions of share-based payment arrangement [line items] | |||
| Exercise price | $ 6.62 | $ 10.24 | $ 9.28 |
| Underlying share price | $ 6.62 | $ 10.24 | $ 9.28 |
| Volatility | 82.34% | 101.93% | 87.98% |
| Time period (years) | yr | 6.01 | 6.04 | 6.06 |
| Risk free rate | 4.06% | 4.08% | 4.07% |
| Dividend yield | 0.00% | 0.00% | 0.00% |
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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The option life of share options granted. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. No definition available.
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- Definition The exercise price of share options granted. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The percentage of an expected dividend used to calculate the fair value of share options granted. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Details
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