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Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Property, Plant, and Equipment, Useful Life [Table Text Block]

Category	Estimated useful life
Office equipment	5 years
Laboratory equipment	3-8 years
Motor vehicles	10 years
Leasehold improvements	Lower of lease term or economic life

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

						Fair value measurement
Recurring fair value measurement		Total fair value				Quoted prices in active markets for identical assets (Level 1)				Significant other observable inputs (Level 2)				Significant unobservable inputs (Level 3)
			$				$				$				$
As of December 31, 2020
Liabilities:
Forward contract (Note 16)			278				-				-				278
As of December 31, 2021
Assets:
Available-for-sale debt securities
Financial products issued by commercial banks			1,574				-				1,574				-
Trading debt securities
Financial products issued by commercial banks			13,169				-				13,169				-
Forward contract (Note 16)			166				-				-				166
Total assets measured at fair value			14,909				-				14,743				166

Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]

					Range
	Valuation technique		Unobservable inputs		as of December 31,
					2020				2021
Forward contract	Discounted cash flow		Discount for lack of marketability			10	%			10	%
			Volatility			80	%			85	%
			Weighted average cost of capital			15.3	%			14.5	%
	Probability-based valuation approach		Probability of achieving contingent target			100	%			90	%

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

		Forward contract
			$
Balance as of December 31, 2019			-
Recognized during the year			(278	)
Gains or losses from changes in fair value			-
Balance as of December 31, 2020 (liability)			(278	)
Gains from changes in fair value			444
Balance as of December 31, 2021 (asset)			166

Property, Plant and Equipment, Location [Table Text Block]

		December 31,
		2020				2021
Property and equipment, net:			$				$
PRC			45				98
U.S.			139				1,324
Total			184				1,422

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