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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and equipment, net & Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Property and equipment, net
Goodwill impairment	$ 0	$ 0	$ 0
Machinery \| Minimum
Property and equipment, net
Useful life	3 years
Machinery \| Maximum
Property and equipment, net
Useful life	10 years
Furniture, fixtures and equipment \| Minimum
Property and equipment, net
Useful life	3 years
Furniture, fixtures and equipment \| Maximum
Property and equipment, net
Useful life	5 years
Vehicles
Property and equipment, net
Useful life	4 years
Medical equipment \| Minimum
Property and equipment, net
Useful life	6 years
Medical equipment \| Maximum
Property and equipment, net
Useful life	10 years
Leasehold improvement
Property and equipment, net
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration]	us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember
Leasehold improvement \| Maximum
Property and equipment, net
Useful life	5 years