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Share-based payments - Estimated the fair value of the share options granted (Details)													12 Months Ended
	Dec. 30, 2021 Options Y $ / shares	Nov. 15, 2021 Options Y $ / shares	Jun. 17, 2021 Y Options $ / shares	May 21, 2021 Options Y $ / shares	Mar. 11, 2021 Y Options $ / shares	Dec. 22, 2020 Options Y $ / shares	Dec. 15, 2020 Y Options $ / shares	Nov. 16, 2020 Options Y $ / shares	Aug. 17, 2020 Y Options $ / shares	Jun. 08, 2020 Options Y $ / shares	May 20, 2020 Options Y $ / shares	Mar. 12, 2020 Y Options $ / shares	Dec. 31, 2021 Options	Dec. 31, 2020 Options
Share-based payments
Exercise price | $ / shares	$ 14.90	$ 14.96	$ 23.14	$ 22.08	$ 28.16	$ 25.01	$ 23.02	$ 24.31	$ 20.39	$ 16.87	$ 17.44	$ 15.15
Expected volatility	84.00%	84.00%	85.00%	85.00%	84.00%	85.00%	85.00%	85.00%	83.00%	84.00%	84.00%	82.00%
Expected life of share options (in years) | Y	6	6	6	6	6	6	6	6	6	6	6	6
Risk-free interest rate	1.69%	1.54%	1.25%	1.34%	1.09%	0.48%	0.45%	0.46%	0.48%	0.58%	0.46%	0.60%
Number of share options issued | Options	105,071	24,500	1,000	555,464	12,000	11,500	10,000	84,900	2,900	80,000	481,405	16,550	698,035	687,255

X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 47
-Subparagraph a
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-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2021-03-24

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- Definition

The option life of share options granted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 47
-Subparagraph a
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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]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 47
-Subparagraph a
-Clause i
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- References

No definition available.

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- Definition

The number of share options granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_ii&doctype=Standard
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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]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
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-URIDate 2021-03-24

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