SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Government Subsidies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) Grants	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Government Subsidies [Abstract]
Number of grants received | Grants	7
Subsidies recognized as reductions of relevant expenses	$ 11,260	$ 2,658	$ 3,195
Subsidies recognized as other income	$ 200	$ 149	$ 147