SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Time Deposits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Time Deposits [Abstract]
Time deposits	$ 118,834		$ 118,834		$ 172,448
Interest income, deposits with financial institutions	867	$ 929	2,779	$ 2,468
China Merchant Bank, Deposits, Maturing on January 29, 2023
Time Deposits [Abstract]
Time deposits	0		$ 0		38,772
Time deposits, interest rate			2.25%
China Everbright Bank, Deposit, Maturing on January 29, 2023
Time Deposits [Abstract]
Time deposits	0		$ 0		14,360
Time deposits, interest rate			2.25%
China Everbright Bank, Deposit, Maturing May 22, 2023
Time Deposits [Abstract]
Time deposits	0		$ 0		3,000
Time deposits, interest rate			5.07%
China Industrial Bank, Deposit, Maturing on January 30, 2023
Time Deposits [Abstract]
Time deposits	0		$ 0		14,360
Time deposits, interest rate			2.15%
China Merchant Bank, Deposit, Maturing January 29, 2024
Time Deposits [Abstract]
Time deposits	27,860		$ 27,860		28,720
Time deposits, interest rate			2.85%
Bank of Ningbo, Deposit, Maturing on February 17, 2024
Time Deposits [Abstract]
Time deposits	41,790		$ 41,790		43,080
Time deposits, interest rate			2.85%
Shanghai Pudong Development Bank, Deposit, Maturing October 20, 2025
Time Deposits [Abstract]
Time deposits	6,965		$ 6,965		7,180
Time deposits, interest rate			3.10%
Shanghai Pudong Development Bank, Deposit, Maturing November 14, 2025
Time Deposits [Abstract]
Time deposits	6,965		$ 6,965		7,180
Time deposits, interest rate			3.10%
Shanghai Pudong Development Bank, Deposit, Maturing December 8, 2025
Time Deposits [Abstract]
Time deposits	4,179		$ 4,179		4,308
Time deposits, interest rate			3.10%
Shanghai Pudong Development Bank, Deposit, Maturing December 15, 2025
Time Deposits [Abstract]
Time deposits	4,179		$ 4,179		4,308
Time deposits, interest rate			3.10%
Shanghai Pudong Development Bank, Deposit, Maturing December 30, 2025
Time Deposits [Abstract]
Time deposits	6,965		$ 6,965		7,180
Time deposits, interest rate			3.10%
China Industrial Bank, Deposit, Maturing January 30, 2026
Time Deposits [Abstract]
Time deposits	13,930		$ 13,930		0
Time deposits, interest rate			3.15%
China Everbright Bank, Deposit, Maturing November 22, 2023
Time Deposits [Abstract]
Time deposits	3,000		$ 3,000		0
Time deposits, interest rate			5.43%
China Everbright Bank, Deposit, Maturing January 5, 2024
Time Deposits [Abstract]
Time deposits	$ 3,001		$ 3,001		$ 0
Time deposits, interest rate			5.38%