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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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.

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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, 2021 USD ($) Y $ / shares	Dec. 31, 2020 USD ($) Y $ / shares	Dec. 31, 2019 USD ($) Y $ / shares
NL
Share-based compensation
Expected annual volatility	80.10%		90.00%
Expected life, years \| Y	6.08	3.92	3.92
Fair value of the common share			$ 1.86
Exercise price		$ 0	$ 0
Risk-free interest rate		0.62%
Weighted average grant date fair value \| $	$ 3.61	$ 2.71	$ 1.86
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%		0.44%
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%		0.76%
US
Share-based compensation
Expected annual volatility	80.10%
Expected life, years \| Y	6.08
Risk-free interest rate	1.34%
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