Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2022

Disclosure of detailed information about intangible assets [abstract]

Summary of Intangible Assets

	Patent rights (available for use)			Patent rights (not yet available for use)			Total
	US$			US$			US$
	(note i)			(note ii)
COST
As of January 1, 2021		375			11,000			11,375
Addition		—			7,500			7,500
As of December 31, 2021 and 2022		375			18,500			18,875
AMORTIZATION AND IMPAIRMENT
As of January 1, 2021		(57	)		(1,000	)		(1,057	)
Charge for the year		(20	)		—			(20	)
Impairment loss recognized		—			(3,000	)		(3,000	)
As of December 31, 2021		(77	)		(4,000	)		(4,077	)
Charge for the year		(20	)		—			(20	)
As of December 31, 2022		(97	)		(4,000	)		(4,097	)
CARRYING VALUES
As of December 31, 2021		298			14,500			14,798
As of December 31, 2022		278			14,500			14,778