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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The option life of share options granted.

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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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The exercise price of share options granted.

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The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

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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]]

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Share-based compensation - Fair value measurement (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) Y $ / shares	Dec. 31, 2021 USD ($) Y $ / shares	Dec. 31, 2020 USD ($) Y $ / shares
NL & US
Share-based compensation
Expected annual volatility	83.90%
Expected life, years \| Y	6.08
Weighted average grant date fair value \| $	$ 4.01
NL & US \| Bottom of range
Share-based compensation
Fair value of the common share	$ 1.71
Exercise price	$ 2.34
Risk-free interest rate	1.65%
NL & US \| Top of range
Share-based compensation
Fair value of the common share	$ 3.91
Exercise price	$ 5.50
Risk-free interest rate	3.78%
NL
Share-based compensation
Expected annual volatility		80.10%
Expected life, years \| Y		6.08	3.92
Exercise price			$ 0
Risk-free interest rate			0.62%
Weighted average grant date fair value \| $		$ 3.61	$ 2.71
NL \| Bottom of range
Share-based compensation
Expected annual volatility			75.50%
Fair value of the common share		$ 3.42	$ 2.10
Exercise price		$ 5.10
Risk-free interest rate		0.30%
NL \| Top of range
Share-based compensation
Expected annual volatility			90.00%
Fair value of the common share		$ 5.23	$ 2.76
Exercise price		$ 7.77
Risk-free interest rate		0.53%
US
Share-based compensation
Expected annual volatility		80.10%
Expected life, years \| Y		6.08
Weighted average grant date fair value \| $		$ 5.95
US \| Bottom of range
Share-based compensation
Fair value of the common share		$ 3.12
Exercise price		$ 5.10
Risk-free interest rate		0.94%
US \| Top of range
Share-based compensation
Fair value of the common share		$ 8.71
Exercise price		$ 15.00
Risk-free interest rate		1.34%