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Stock-based compensation (Tables)

12 Months Ended

Dec. 31, 2023

Compensation Related Costs [Abstract]

Stock-Based Compensation - Schedule of Share Based Payment Award, Stock Options, Valuation Assumptions

The following assumptions were used to calculate the compensation expense and the calculated fair value of stock options granted:

Assumption	As of December 31, 2023		As of December 31, 2022		As of December 31, 2021
Dividend yield	None		None		None
Risk-free interest rate used (average)	1.00%		n/a		n/a
Expected market price volatility	73.19%		n/a		n/a
Average remaining expected life of stock options on F shares (years)	6.19		n/a		n/a

Stock-Based Compensation - Schedule of Share Based Compensation Stock Options Activity

The following table illustrates the development of the Group’s non-vested options for the years ended December 31, 2023 and 2022.

Non-vested options on F shares	Number of F shares under options		Weighted-average grant date fair value (USD)
Non-vested options as at December 31, 2021	—		—
Granted	—		—
Vested	—		—
Non-vested forfeited or cancelled	—		—
Non-vested options as at December 31, 2022	—		—
Granted	77		6.39
Vested	77		6.39
Non-vested forfeited or cancelled	—		—
Non-vested options as at December 31, 2023	—		—

The following tables summarize the Group’s stock option activity for the years ended December 31, 2023 and 2022.

Options on F shares	F shares under options		Weighted-average exercise price (USD)		Weighted average remaining contractual term (in years)		Aggregate intrinsic value (USD)
Outstanding as at December 31, 2021	—		0.00		0.00		—
Of which vested	—		0.00		0.00		—
Granted	—		—		—		—
Outstanding as at December 31, 2022	—		0.00		0.00		—
Of which vested	—		0.00		0.00		—
Granted	—		—		—		—
Outstanding as at December 31, 2023	77		0.05		6.19		19
Of which vested	77		0.05		6.19		19

Stock-Based Compensation - Schedule of Compensation Expense

Summary of stock-based compensation expenses

Stock-based compensation expenses	12 months ended December 31,
USD	2023		2022		2021
In relation to F share Option Plan (FSOP)	492		—		—
In relation to non-FSOP option agreements	—		—		—
Total	492		—		—

Stock-based compensation expenses are recorded under the following expense categories in the income statement.

Stock-based compensation expenses	12 months ended December 31,
USD	2023		2022		2021
Research & development expenses	—		—		—
Selling & marketing expenses	—		—		—
General & administrative expenses	492		—		—
Total	492		—		—