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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Assets measured at fair value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2025
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Impairment expense	$ 0
Zhejiang ordinary smile
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Recognized intangible assets arising from business combination		$ 11,010
Terminal growth rate
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Goodwill measurement input	2.90%
Discount rate
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Goodwill measurement input	23.00%

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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