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FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2022

Carrying Amounts and Estimated Fair Values of Financial Instruments

The following table presents the carrying amounts and estimated fair values of our Company’s financial instruments at December 31, 2022 and 2021.

(in US$ thousands)		2022								2021
		Carrying amount				Fair value				Carrying amount				Fair value
Financial assets
Cash and cash equivalents		$	38,794			$	38,794			$	41,455			$	41,455
Accounts receivable			199				199				265				265
Restricted cash			313				313				306				306
Refundable deposits			192				192				211				211
Investment in securities - current			7,950				7,950				—				—
Investment in securities - noncurrent			2,371				2,371				10,322				10,322
Financial liabilities
Accounts payable			53				53				118				118
Accrued expenses			1,151				1,151				1,435				1,435
Lease liabilities - current and noncurrent			1,333				1,333				1,987				1,987

Summary of Assets and Liabilities Measured at Fair Value

Assets and liabilities measured at fair value on a recurring basis are summarized as below:

(in US$ thousands)		Fair Value Measurement Using
		Level 1				Level 2				Level 3				At December 31, 2022
Assets
Restricted cash - time deposits		$	—			$	313			$	—			$	313
Investment in securities - current			—				—				7,950				7,950
Investment in securities - noncurrent			—				—				2,371				2,371
		$	—			$	313			$	10,321			$	10,634

(in US$ thousands)		Fair Value Measurement Using
		Level 1				Level 2				Level 3				At December 31, 2021
Assets
Restricted cash - time deposits		$	—			$	306			$	—			$	306
Investment in securities - noncurrent			—				—				10,322				10,322
		$	—			$	306			$	10,322			$	10,628

Reconciliation of Beginning and Ending Balances of Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs Level Three

For assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during 2022 and 2021, a reconciliation of the beginning and ending balances are presented as follows:

(in US$ thousands)		2022
		Investment in debt securities				Investment in equity securities
Balance at beginning of year		$	8,132			$	2,190
Purchase			—				—
Disposal			—				—
Total gains or (losses) (realized/unrealized)
included in earnings			—				409
included in other comprehensive income - unrealized gain (loss) on security			620				—
included in other comprehensive income - foreign currency items			(802	)			(228	)
Balance at end of year		$	7,950			$	2,371
The amount of total gains or (losses) for the period    included in earnings attributable to the change in    unrealized gains or losses relating to assets still held at    the reporting date.		$	—			$	409

(in US$ thousands)		2021
		Investment in debt securities				Investment in equity securities
Balance at beginning of year		$	10,000			$	—
Purchase			—				2,190
Disposal			(2,033	)			—
Total gains or (losses) (realized/unrealized)
included in earnings			—				—
included in other comprehensive income - unrealized gain (loss) on security			(124	)			—
included in other comprehensive income - foreign currency items			289				—
Balance at end of year		$	8,132			$	2,190
The amount of total gains or (losses) for the period    included in earnings attributable to the change in    unrealized gains or losses relating to assets still held at    the reporting date.		$	—			$	—

Level 3

Summary of Significant Unobservable Inputs Used in Fair Value Measurements Categorized Within Level 3 of Fair Value Hierarchy

The significant unobservable inputs used in the fair value measurements categorized within Level 3 of the fair value hierarchy, together with a quantitative sensitivity analysis as of December 31, 2022 and 2021 are shown below: Investment in securities - Level 3 financial assets Sensitivity of the Input to Fair Value
					Changes of Fair Value (in US$ thousands)
Calculation Date	Valuation Technique	Significant Unobservable Inputs	Rate for debt investment	Rate for equity investment	If the Rate of Input changes by -1%	If the Rate of Input changes by +1%
December 31, 2022	The discounted cash flow analysis to estimate the enterprise value, and then the  option pricing method to allocate equity value among various classes of stakeholders.	Discount rate for future cash flows	38.5%	38.5%	Debt securities: +$372 Equity securities: +$175	Debt securities: -$262 Equity securities: -$170
		Discount for lack of marketability (“DLOM”)	From 4.0% to 12.0% for different scenarios	From 6.0% to 12.0% for different scenarios	Debt securities: +$93 Equity securities: +$26	Debt securities: -$93 Equity securities: -$25
		Volatility	From 28% to 31.0% for different scenarios	From 28% to 31.0% for different scenarios	Debt securities: +$23 Equity securities: +$16	Debt securities: +$24 Equity securities: -$10
December 31, 2021	The backsolve method to estimate the enterprise value, and then the  option pricing method to allocate equity value among various classes of stakeholders	Discount for lack of marketability (“DLOM”)	From 9.0% to 18.0% for different scenarios	From 11.0% to 18.0% for different scenarios	Debt securities: +$93 Equity securities: +$26	Debt securities: -$92 Equity securities: -$26
		Volatility	36.0%	36.0%	Debt securities: -$9 Equity securities: +$13	Debt securities: +$2 Equity securities: -$12

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