Share-based payment arrangements - Stock option valuation (Details) - 2018 LTIP - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Share-based payment arrangements
Fair value at grant date	$ 5.03	$ 5.97
Share price at grant date	6.61	7.67
Exercise price	$ 6.57	$ 7.76
Expected volatility (as a percent)	93.20%	87.20%
Expected life	6 years 3 months 18 days	6 years 10 months 24 days
Risk-free interest rate (based on government bonds)	1.19%	1.90%

Expected life of options granted.

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- Definition

Fair value at date of grant of share-based payment arrangement.

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No definition available.

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 47
-Subparagraph a
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-URIDate 2020-01-01

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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]]

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

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- Definition

The exercise price of share options granted.

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- Definition

The weighted average share price. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 45
-Subparagraph c
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-URIDate 2020-01-01

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