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Share-based compensation - Schedule of fair value assumptions of share options granted (Details) - Stock options	12 Months Ended
	Dec. 31, 2021 Year $ / shares	Dec. 31, 2020 Year $ / shares	Dec. 31, 2019 Year $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expected dividend yield	0.00%	0.00%	0.00%
Expected life (years) | Year			5
Expected volatility		120.00%	100.00%
Bottom of range
Disclosure of terms and conditions of share-based payment arrangement [line items]
Grant date share price	$ 1.96	$ 3.75	$ 6.45
Exercise price	$ 1.70	$ 3.68	$ 7.17
Risk free interest rate	0.34%	0.27%	1.24%
Expected life (years) | Year	2	4
Expected volatility	116.00%
Top of range
Disclosure of terms and conditions of share-based payment arrangement [line items]
Grant date share price	$ 2.85	$ 9.54	$ 75.38
Exercise price	$ 4.25	$ 9.80	$ 75.38
Risk free interest rate	1.10%	1.55%	1.90%
Expected life (years) | Year	6	9
Expected volatility	132.00%

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
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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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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.

+ References

No definition available.

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- Definition

The exercise price 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
-Clause i
-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 percentage of an expected dividend used to calculate the fair value 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
-Clause i
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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
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