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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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Number of major customers who contributes 10% or more of entity's total revenue.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Operating and Financial Risks (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) Customer	Dec. 31, 2020 USD ($) Customer	Dec. 31, 2019 USD ($)
Foreign Currency Risk and Translation [Abstract]
Foreign currency translation adjustment \| $	$ 4,695	$ 10,493	$ (899)
Revenue [Member]
Concentration of Credit Risk [Abstract]
Number of major customers \| Customer	2	3
Customer [Member] \| Revenue [Member] \| Customer Concentration Risk [Member]
Concentration of Credit Risk [Abstract]
Concentration of credit risk	48.90%	75.80%
Customer A [Member] \| Revenue [Member] \| Customer Concentration Risk [Member]
Concentration of Credit Risk [Abstract]
Concentration of credit risk	28.10%	36.90%
Customer B [Member] \| Revenue [Member] \| Customer Concentration Risk [Member]
Concentration of Credit Risk [Abstract]
Concentration of credit risk	20.80%	26.80%
Customer C [Member] \| Revenue [Member] \| Customer Concentration Risk [Member]
Concentration of Credit Risk [Abstract]
Concentration of credit risk		12.10%
RMB [Member]
Consolidated balance sheets [Abstract]
Exchange rate	6.3757	6.5232	6.9784
Consolidated statements of operations and comprehensive income [Abstract]
Exchange rate	6.4515	6.8966	6.8966
KRW [Member]
Consolidated balance sheets [Abstract]
Exchange rate	1,145.48	1,088.14	1,156.07
Consolidated statements of operations and comprehensive income [Abstract]
Exchange rate	1,190.48	1,179.25	1,165.50